MCQ Questions

Free PDF Download of CBSE Class 10 Science Chapter 8 How do Organisms Reproduce? Multiple Choice Questions with Answers. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 10 Science How do Organisms Reproduce? Multiple Choice Questions with Answers to know their preparation level.

Class 10 Science MCQs Chapter 8 How do Organisms Reproduce?

1. During favourable conditions, Amoeba reproduces by
(a) multiple fission
(b) binary fission
(c) budding
(d) fragmentation

Answer

Answer: b

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2. A feature of reproduction that is common to Amoeba, Yeast and Spirogyra is that
(a) they reproduce asexually
(b) they are all unicellular
(c) they reproduce only sexually
(d) they are all multicellular

Answer

Answer: a

---

3. The ability of a cell to divide into several cells during reproduction in Plasmodium is called
(a) budding
(b) multiple fission
(c) binary fission
(d) reduction division

Answer

Answer: b

---

4. Bryophyllum can be propagated vegetatively by the
(a) stem
(b) leaf
(c) root
(d) flower

Answer

Answer: b

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5. Vegetative propagation refers to formation of new plants from
(a) stem, flowers and fruits
(b) stem, leaves and flowers
(c) stem, roots and flowers
(d) stem, roots and leaves

Answer

Answer: d

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6. In a potato, vegetative propagation takes place by:
(a) root
(b) leaf
(c) stem tuber
(d) grafting

Answer

Answer: c

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7. Vegetatively propagated plants
(a) do not bear roots
(b) do not bear buds
(c) are genetically similar
(d) are genetically dissimilar

Answer

Answer: c

---

8. Spirogyra reproduce by
(a) budding
(b) fragmentation
(c) regeneration
(d) fission

Answer

Answer: b

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9. In Rhizopus, tubular thread like structures bearing sporangia at their tips are called
(a) filaments
(b) hyphae
(c) rhizoids
(d) roots

Answer

Answer: b

---

10. Plants like banana, rose, jasmine, orange have lost the capacity to produce
(a) seeds
(b) buds
(c) flower
(d) roots

Answer

Answer: a

---

11. The flower of the Hibiscus plant is
(a) bisexual
(b) unisexual
(c) neuter
(d) very small

Answer

Answer: a

---

12. The part of the flower which is present in the centre of the flower is
(a) Sepals
(b) Petals
(c) Carpels
(d) Stamens

Answer

Answer: c

---

13. The seed that contains the future plant is called the
(a) cotyledons
(b) seed coat
(c) germ cells
(d) embryo

Answer

Answer: d

---

14. The period of pregnancy is called
(a) gestation period
(b) incubation period
(c) ovulation
(d) menstruation period

Answer

Answer: a

---

15. The process of release of eggs from the ovary is called
(a) menstruation
(b) reproduction
(c) insemination
(d) ovulation

Answer

Answer: d

---

16. The period during adolescence when the reproductive tissues begin to mature is called
(a) ovyfetion
(b) puberty
(c) germination
(d) propagation

Answer

Answer: b

---

17. In human beings, the fertilization occurs in the
(a) uterus
(b) ovaries
(c) fallopian tubes
(d) vagina

Answer

Answer: c

---

18. Along the path of the vas-deferens the secretions of which gland provide nutrition to the sperms?
(a) Prostate glands
(b) Seminal vesicles
(c) Scrotum
(d) Urinary bladder

Answer

Answer: b

---

19. The embryo in humans gets nutrition from the mother’s blood with the help of a special tissue called
(a) Placenta
(b) Villi
(c) Uterus
(d) Womb

Answer

Answer: a

---

20. Which among the following diseases is not sexually transmitted?
(a) Syphyllis
(b) Hepatitis
(c) HIV-AIDS
(d) Gonorrhea

Answer

Answer: b

---

21. Which of the following method of contraception protects from acquiring sexually trans¬mitted diseases?
(a) Surgery
(b) Condoms
(c) Copper-T
(d) Oral-pills

Answer

Answer: b

---

22. In human males, the testes lie in the scrotum, because it helps in the
(a) process of mating
(b) formation of sperms
(c) easy transfer of gametes
(d) secretion of estrogen

Answer

Answer: b

---

23. There is a greater possibility for the evolution of a new species in organisms which reproduce by
(a) binary fission
(b) budding
(c) fertilisation
(d) regeneration

Answer

Answer: c

---

24. Which is the most common method of reproduction in majority of fungi and bacteria?
(a) Budding
(b) Spore formation
(c) Binary fission
(d) Multiple fission

Answer

Answer: b

---

25. Which of the following is not an artificial method of vegetative propagation?
(a) Cutting
(b) Layering
(c) Budding
(d) Grafting

Answer

Answer: c

---

26. Many unicellular organisms reproduce by the process of
(a) fission
(b) ovulation
(c) regeneration
(d) non-disjunction

Answer

Answer: a

---

27. The ability of an organism to develop whole body from a broken piece or fragment is called
(a) binary fission
(b) budding
(c) multiple fission
(d) regeneration

Answer

Answer: d

---

28. Pollen grains are produced by
(a) ovary
(b) ovule
(c) apther
(d) corolla

Answer

Answer: c

---

29. The fertilisation of human egg by the sperm takes place in
(a) vagina
(b) uterus
(c) ovary
(d) oviduct

Answer

Answer: d

---

30. Which of the following is a primary sex organ in a mammal?
(a) Ovary
(b) Vagina
(c) Uterus
(d) Mammaiy glands

Answer

Answer: a

---

31. The ability to reproduce is lost in a female after
(a) fertilisation
(b) menstruation
(c) gamete formation
(d) menopause

Answer

Answer: d

---

32. When a sperm is deposited into the vagina which route does it travel?
(a) Vagina → Oviduct → Uterus → Cervix
(b) Vagina → Ovary → Uterus → Oviduct
(c) Vagina → Cervix → Uterus → Oviduct
(d) Vagina → Uterus → Cervix → Oviduct

Answer

Answer: c

---

33. In case the ova does not fertilise, which of the following events will take place?
(a) Menstruation
(b) Pregnancy
(c) Implantation
(d) Ovulation

Answer

Answer: a

---

34. When the foetus is growing inside the uterus it needs nutrients. Which part provides these nutrients?
(a) Placenta
(b) Amniotic sac
(c) Oviduct
(d) Uterus

Answer

Answer: a

---

35. What marks the beginning of the reproductive life of a woman?
(a) Menopause
(b) Menarche
(c) Fertilisation
(d) Ovulation

Answer

Answer: b

---

36. Where does fertilisation take place?
(a) Uterus
(b) Vagina
(c) Fallopian tube
(d) Cervix

Answer

Answer: c

---

37. A pair of duct arising from testis, which carry sperms are
(a) fallopian tube
(b) vas deferens
(c) oviduct
(d) urethra

Answer

Answer: b

---

38. In the list of organisms given below, those that reproduce by the asexual method are [NCERT Exemplar Problems]
(i) banana
(ii) dog
(iii) yeast
(iv) Amoeba
(a) (ii) and (iv)
(b) (i), (iii) and (iv)
(c) (i) and (iv)
(d) (ii), (iii) and (iv)

Answer

Answer: b

---

Direction (39 to 43): In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
39. Assertion: Amoeba reproduced by fission
Reason: All unicellular organisms reproduced by asexual method.

Answer/Explanation

Answer: a
Explanation:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

---

40. Assertion: In human beings, the female. play a major role in determining the sex of the offspring.
Reason: Women have two X chromosomes.

Answer/Explanation

Answer: d
Explanation:
(d) The statement of the Assertion is false but the Reason is true.

---

41. Assertion: In male reproductive system, transport of sperm takes place in a fluid which also provide nutrition.
Reason: Protective glands and seminal vesicles secret in the vas deferens.

Answer/Explanation

Answer: a
Explanation:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

---

42. Assertion: Plants raised by vegetative propagation can bear flower and seed earlier than those produced from seeds.
Reason: Plants which lost capacity to bear viable seeds, can propagate through vegetable propagation.

Answer/Explanation

Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

---

43. Assertion: Ovary releases one egg every month.
Reason: The lining of uterus is always thick and spongy.

Answer/Explanation

Answer: c
Explanation:
(c) Assertion is true but the Reason is false.

---

44. The gestation period in human beings is about days.

Answer/Explanation

Answer:
Explanation: 280

---

45. The process of release of an egg from the ovary is called .

Answer/Explanation

Answer:
Explanation: ovulation

---

46. The development of foetus inside the uterus till birth is called .

Answer/Explanation

Answer:
Explanation: gestation

---

47. The attachment of the embryo to the uterus is called .

Answer/Explanation

Answer:
Explanation: implantation

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48. Sterilisation in males is called .

Answer/Explanation

Answer:
Explanation: vasectomy

---

49. The ability of a cell to divide into several cells during reproduction in . is called .

Answer/Explanation

Answer:
Explanation: Plasmodium, multiple fission

---

50. The disease is caused by microorganism known as .

Answer/Explanation

Answer:
Explanation: kala-azar, leishmania

---

51. The organism like can reproduce by the method of .

Answer/Explanation

Answer:
Explanation: spirogyra, fragmentation

---

52. In Rhizopus the fine thread like structures spread on the whole surface of slice of bread are called .

Answer/Explanation

Answer:
Explanation: hyphae

---

53. A tiny animal having tentacles which reproduces by growing buds on the side of its body is .

Answer/Explanation

Answer:
Explanation: hydra

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54. The importance of variations in organisms is that it helps the species of various organisms to survive in adverse environment. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

55. Complex multicellular organisms cannot give rise to new organisms through budding. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

56. Testes are the primary reproductive organs in man. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

57. An embryo is formed by the growth and development of an foetus. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

58. An important feature of barrier method is that it protects a person from STDs. [True/F alse]

Answer/Explanation

Answer:
Explanation: True

---

59. The killing of the unborn girl child is called female foeticide. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

60. The surgical procedure carried out in females is called vasectomy. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

61. Copper-T cannot protect from acquiring sexually transmitted diseases. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

62. Gonorrhoea and syphilis are caused by bacteria. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

Direction (63 to 64): Column II. Match column I with
63.

Column I	Column II
(i) Placenta	(A) Binary fission
(ii) Male gametes of plant	(B) Bryophylium
(iii) Budding	(C) Nourishment of embryo
(iv) Amoeba	(D) Yeast
(v) Vegetative propagation by leaves	(E) Pollen grains

Answer/Explanation

Answer:
Explanation:
(i) (C)
(ii) (E)
(iii) (D)
(iv) (A)
(v) (B)

---

64.

Column I	Column II
(i) Fission	(A) Spirogyra
(ii) Fragmentation	(B) Hydra
(iii) Regeneration	(C) Bryophyllitm
(iv) Budding	(D) Amoeba
	(E) Planaria

Answer/Explanation

Answer:
Explanation:
(i) (C)
(ii) (A)
(iii) (D)
(iv) (B)

---

65. Name the life process of an organism that helps in the growth of its population. [At 2015]

Answer/Explanation

Answer:
Explanation: Reproduction.

---

66. What are the two types of reproduction?

Answer/Explanation

Answer:
Explanation:
Sexual and asexual reproduction.

---

67. Which is the most basic event in reproduction?

Answer/Explanation

Answer:
Explanation:
Creation of a DNA copy.

---

68. Write the full form of DNA.

Answer/Explanation

Answer:
Explanation:
The full form of DNA is deoxyribonucleic acid.

---

69. What is DNA? [Foreign 2015]

Answer/Explanation

Answer:
Explanation:
The full form of DNA is deoxyribonucleic acid. DNA lies in the cell nucleus which is the information source for making proteins, and different proteins lead to different designs.

---

70. Where is DNA found in a cell? [DoE; AI 2015]

Answer/Explanation

Answer:
Explanation:
DNA is found in the nucleus.

---

71. What is DNA copying? [Delhi 2015]

Answer/Explanation

Answer:
Explanation:
DNA in the cell nucleus is the information source for making proteins and different proteins lead to different body designs. Dining reproduction, similar copy of DNA is generated and the process is called DNA copying.

---

72. What is the effect of DNA copying which is not perfectly accurate on the reproduction process? [HOTS]

Answer/Explanation

Answer:
Explanation:
DNA copying is not perfectly accurate and the resultant errors are a source of variations in populations of organisms.

---

73. Mention the mode of reproduction used by
(a) Amoeba
(b) Planaria [HOTS]

Answer/Explanation

Answer:
Explanation:
Mode of reproduction used by
(a) Amoeba is binary fission.
(b) Planaria is regeneration.

---

74. Name two organisms which are reproduced by binary fission.

Answer/Explanation

Answer:
Explanation:
Amoeba and leishmania are reproduced by binary fission.

---

75. Name the causative agent of the disease “Kala-azar” and its mode of asexual reproduction. [Foreign 2015]

Answer/Explanation

Answer:
Explanation:
Leishmania causes kala-azar. It reproduces by binary fission.

---

76. Name the method by which spirogyra reproduces under favourable conditions. Is this method sexual or asexual? [Delhi 2017]

Answer/Explanation

Answer:
Explanation:
Spirogyra reproduces by fragmentation.
It is an asexual method of reproduction.

---

77. Name two simple organisms having the ability of regeneration. [AI 2015]

Answer/Explanation

Answer:
Explanation: Hydra and Planaria.

---

78. What is the difference between fission and fragmentation?

Answer/Explanation

Answer:
Explanation:
In fission, an unicellular organism breaks up to form two new organisms whereas in case of fragmentation a multicellular organisms breaks up to form two new organisms.

---

79. Name the method by which Hydra reproduces. Is this method sexual or asexual? [Foreign 2016]

Answer/Explanation

Answer:
Explanation:
Hydra reproduces by budding. It is an asexual method.

---

80. What happens to a slice of bread kept in a moist dark place?

Answer/Explanation

Answer:
Explanation: Rhizopus fungus will develop.

---

81. Name the part of Bryophyllum where the buds are produced for vegetative propagation. [Delhi 2016]

Answer/Explanation

Answer:
Explanation:
Vegetative part, leaf is used in the propagation of Bryophyllum.

---

82. Select two plants raised by the method of vegetative propagation from the list given below:
banana, gram, rose, tomato, wheat, jasmine.

Answer/Explanation

Answer:
Explanation:
Banana, jasmine and rose are raised by vegetative method.

---

83. State what type of method is used for growing jasmine plant. [DoE; HOTS]

Answer/Explanation

Answer:
Explanation:
Artificial methods of vegetative propagation like layering is used for growing jasmine plant.

---

84. Do you know which part become a new plant in vegetation propagation?

Answer/Explanation

Answer:
Explanation: Root, stem and leaves.

---

85. What are those organisms called which bear both the sex organs in the same individual. Give one example of such organism. [AI2016]

Answer/Explanation

Answer:
Explanation:
Organisms which bear both the sex organs are called hermaphrodite/bisexual.
Example: Earthworm

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86. What is a bisexual flower? Give one example. [DoE]

Answer/Explanation

Answer:
Explanation:
A bisexual flower is a flower that contains both stamens and carpel. Example: Hibiscus.

---

87. Name the parts of a bisexual flower that are not directly involved in reproduction. [Foreign 2015]

Answer/Explanation

Answer:
Explanation:
Parts of a bisexual flower which are not directly involved in reproduction are
(i) Petal, (ii) Sepal and (iii) Stem.

---

88. Write suitable conditions necessary for seed germination. [DoE]

Answer/Explanation

Answer:
Explanation:
Conditions necessary for seed germination are water, temperature and oxygen.

---

89. Name the floral parts of a plant that develop into (i) Fruit (ii) Seeds. [DoE]

Answer/Explanation

Answer:
Explanation:
(i) Fruit: Ovary
(ii) Seed: Ovule

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90. What is carpel?

Answer/Explanation

Answer:
Explanation:
It is the female reproductive organ of the plant.

---

91. Name the part of female reproductive system where the egg is fertilized. [DoE]

Answer/Explanation

Answer:
Explanation:
Egg gets fertilized in the oviduct.

---

92. What is the average duration of human pregnancy? [HOTS]

Answer/Explanation

Answer:
Explanation:
The average duration of human pregnancy is 40 weeks or 280 days.

---

93. Name the largest cell present in the human body. [HOTS]

Answer/Explanation

Answer:
Explanation:
The largest cell present in the human body is ovum.

---

94. Name the organs producing sperms and ova respectively in humans. [Foreign 2017]

Answer/Explanation

Answer:
Explanation:
Testes produce sperms and ovary produces ova.

---

95. Name the hormones responsible for secondary sexual characters in
(i) Girls
(ii) Boys. [DoE]

Answer/Explanation

Answer:
Explanation:
(i) Girls: Estrogen and progesterone
(ii) Boys: Testosterone

---

96. What is Gestation period? [DoE]

Answer/Explanation

Answer:
Explanation:
The time period from the development of the foetus till birth is called gestation period.

---

97. What are the male and female gonads in human beings ? [HOTS]

Answer/Explanation

Answer:
Explanation:
Male gonads are testis and female gonads are ovaries in human beings.

---

98. Define Zygote.

Answer/Explanation

Answer:
Explanation:
The cell which is formed by the fusion of a male gamete and a female gamete is called zygote, i.e., it is a ‘fertilised ovum’ or ‘fertilised egg’.

---

99. What is Puberty?

Answer/Explanation

Answer:
Explanation:
It is the age at which the sex hormones or gametes begin to be produced and the boy or girl becomes sexually mature.

---

100. What is adolesence?

Answer/Explanation

Answer:
Explanation:
Stage between childhood and adulthood.

---

101. Name the liqiud which contains sperms.

Answer/Explanation

Answer:
Explanation: Semen.

---

102. Define implantation with respect to human reproductive system.

Answer/Explanation

Answer:
Explanation:
It is the close attachment of embryo to the utemine wall.

---

103. Name the parts of the human female reproductive system where implantation of the fertilised egg occurs.

Answer/Explanation

Answer:
Explanation:
Implantation of fertilized egg takes place in the uterus.

---

104. Which one of the STDs damages the immune system of human body? [HOTS]

Answer/Explanation

Answer:
Explanation:
AIDS damages the immune system of human body.

---

105. Name the causative organisms for the following diseases:
(a) AIDS
(b) Warts
(c) Gonorrhoea
(d) Syphilis

Answer/Explanation

Answer:
Explanation:
(a) virus
(b) virus
(c) bacteria
(d) bacteria

---

106. Name the contraceptive device which protects a person from acquiring sexually transmitted diseases.

Answer/Explanation

Answer:
Explanation: Condom.

---

107. What is the role of seminal vesicles and the prostate gland? [DoE, AI 2011]

Answer/Explanation

Answer:
Explanation:
(i) Seminal vesicles are a pair of thin-walled muscular elongated sac which secrete fluid for nourishment and smooth transport of sperms.
(ii) Prostate gland also produce fluid which is released in the urethra along with the secretion of seminal vesicles to make transportation of sperms easier and also provides nutrition.

---

Fill in the Blanks

1. The process of reproduction involving only one cell or one parent is called ………….. .
2. ………….. is a duct coming from the urinary bladder which carries sperms.
3. Process of fertilization takes place in the ………….. tube in humans.
4. ………….. is the ability of an organism to replace its lost body parts.
5. ………….. is called the production of new plants from stems, roots or leaves.
6. ………….. is the term used to refer to the commencement of menstruation at puberty.
7. ………….. is the virus that causes AIDS.

Answers

1. Uniparental/ Asexual reproduction
2. Vas deferens
3. fallopian
4. Regeneration
5. Vegetative propagation
6. Menarch
7. HIV-Human Immuno Virus

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Free PDF Download of CBSE Class 10 Science Chapter 7 Control and Coordination Multiple Choice Questions with Answers. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 10 Science Control and Coordination Multiple Choice Questions with Answers to know their preparation level.

Class 10 Science MCQs Chapter 7 Control and Coordination

1. Which plant hormone promotes dormancy in seeds and buds?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Abscisic acid

Answer

Answer: d

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2. Roots of plants are:
(a) positively geotropic
(b) negatively geotropic
(c) positively phototropic
(d) None of these

Answer

Answer: a

---

3. Response of plant roots towards water is called:
(a) Chemotropism
b) Phototropism
(c) Hydrotropism
(d) Geotropism

Answer

Answer: c

---

4. Movement of sunflower in accordance with the path of Sun is due to
(a) Chemotropism
(b) Geotropism
(c) Phototropism
(d) Hydrotropism

Answer

Answer: c

---

5. Which plant hormone promotes cell division?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Abscisic acid

Answer

Answer: c

---

6. The main function of abscisic acid in plants is
(a) to promote cell division.
(b) to inhibit growth.
(c) to promote growth of stem.
(d) to increase the length of cells.

Answer

Answer: b

---

7. Fall of mature leaves and fruits from plants is triggered by which of the following substance?
(a) Auxin
(b) Cytokinin
(c) Gibberellin
(d) Abscisic acid

Answer

Answer: d

---

8. Any change in the environment to which an organism responds is called
(a) stimulus
(b) coordination
(c) response
(d) hormone

Answer

Answer: a

---

9. A part of the body which responds to the in-structions sent from nervous system is called
(a) receptor
(b) effector
(c) nerves
(d) muscles

Answer

Answer: b

---

10. The longest fibre on the cell body of a neuron is called
(a) sheath
(b) cytoplasm
(c) axon
(d) dendrites

Answer

Answer: c

---

11. Which nerves transmit impulses from the cen¬tral nervous system towards muscle cells?
(a) Sensory nerves
(b) Motor nerves
(c) Relay nerves
(d) Cranial nerves

Answer

Answer: b

---

12. A microscopic gap between a pair of adjacent neurons over which nerve impulses pass is called
(a) neurotransmitter
(b) dendrites
(c) axon
(d) synapse

Answer

Answer: d

---

13.

Give the missing term.
(a) Spinal cord
(b) Brain
(c) Cranial nerves
(d) Relay nerves

Answer

Answer: a

---

14. The highest coordinating centre in the human body is
(a) spinal cord
(b) heart
(c) brain
(d) kidney

Answer

Answer: c

---

15. Main function of cerebrum is
(a) thinking
(b) hearing
(c) memory
(d) balancing

Answer

Answer: a

---

16. Posture and balance of the body is controlled by
(a) Pons
(b) Medulla oblongata
(c) Cerebellum
(d) Cerebrum

Answer

Answer: c

---

17. Breathing is controlled by which part of the brain?
(a) Cerebrum
(b) Cerebellum
(c) Hypothalamus
(d) Medulla oblongata

Answer

Answer: d

---

18. Which part of nervous system controls the re¬flex activities of the body?
(a) Brain
(b) Spinal cord
(c) Cerebrum
(d) Cerebellum

Answer

Answer: b

---

19. Which of the following acts as both endocrine and exocrine gland?
(a) Pancreas
(b) Thyroid
(c) Adrenal
(d) Liver

Answer

Answer: a

---

20. Identify which of the following statements about thyroxin is incorrect?
(a) Thyroid gland requires iodine to synthesize thyroxin.
(b) Thyroxin is also called thyroid hormone.
(c) It regulates protein, carbohydrates and fat metabolism in the body.
(d) Iron is essential for the synthesis of thyroxin.

Answer

Answer: d

---

21. Which gland secretes the growth hormone?
(a) Pituitary gland
(b) Thyroid
(c) Hypothalamus
(d) Adrenal

Answer

Answer: a

---

22. The secretion of which hormone leads to physical changes in the body when you are 10-12 years of age?
(a) Oestrogen from testes and testosterone from ovar.
(b) Estrogen from adrenal gland and testosterone from pituitary gland.
(c) Testosterone from testes and estrogen from ovary.
(d) Testosterone from thyroid gland and estrogen from pituitary gland.

Answer

Answer: c

---

23. A diabetic patient suffers from deficiency of which hormone?
(a) Thyroxine
(b) Testosterone
(c) Oestrogen
(d) Insulin

Answer

Answer: d

---

24. Which of the following endocrine glands does not exist in pairs?
(a) Testes
(b) Adrenal
(c) Pituitary
(d) Ovary

Answer

Answer: c

---

25. Which part of a nerve cell contains a nucleus?
(a) Axon
(b) Dendrite
(c) Cyton
(d) Nerve endings

Answer

Answer: c

---

26. Reflex arc is formed by
(a) muscle → brain → receptor
(b) muscle → spinal cord → receptor
(c) receptor → brain → muscles
(d) receptor → spinal cord → muscle

Answer

Answer: d

---

27. Which of the following tissues provide control and coordination in animals?
(a) Nervous and Skeletal
(b) Muscular and Skeletal
(c) Muscular and Transport
(d) Nervous and Muscular

Answer

Answer: d

---

28. A student accidentally places her hand on a flame of candle and quickly pulls her hand away. The flame represents
(a) a response
(b) a stimulus
(c) an impulse
(d) an effector

Answer

Answer: b

---

29. How many pairs of cranial nerves are present in man?
(a) 12
(b) 21
(c) 31
(d) 41

Answer

Answer: a

---

30. Reflex actions are mediated through
(a) brain
(b) effectors
(c) spinal cord
(d) receptors

Answer

Answer: c

---

31. The leaves of Mimosa are sensitive to
(a) light
(b) smell
(c) touch
(d) heat

Answer

Answer: c

---

32. Which statement is incorrect about auxins?
(a) They promote the growth of root
(b) They promote the growth of shoot
(c) They influence the formation of flower and ripening of fruit
(d) They inhibit the growth of root

Answer

Answer: a

---

33. The hormone that is used to keep flowers fresh is
(a) cytokinin
(b) gibberellins
(c) auxin
(d) abscisic acid

Answer

Answer: a

---

34. The main effect of cytokinin in plants is to
(a) improve the quality of fruits
(b) prevent the growth of lateral buds
(c) regulate opening and closing of stomata
(d) stimulate cell division
(e) increase the length of intemodes on flowering stems

Answer

Answer: d

---

35. Abscisic acid controls
(a) cell elongation and cell wall formation
(b) shoot elongation
(c) cell division
(d) leaf fall and dormancy

Answer

Answer: d

---

36. Which endocrine gland is also known as ‘master gland’?
(a) Pancreas
(b) Adrenal
(c) Pituitary
(d) Hypothalamus

Answer

Answer: c

---

37. Which of the following acts as both endocrine and exocrine glands?
(a) Adrenal
(b) Pituitary
(c) Ovaries
(d) Pancreas

Answer

Answer: d

---

38. Which hormone regulates the ionic balance in the body?
(a) Glucagon
(b) Thyroxine
(c) Testosterone
(d) Vasopressin

Answer

Answer: d

---

39. Which of the following is not a ductless gland?
(a) Adrenal
(b) Liver
(c) Thyroid
(d) Pituitary

Answer

Answer: b

---

40. Ageing in human beings is caused by disappearance of which of the following glands?
(a) Adrenal
(b) Pituitary
(c) Thyroid
(d) Thymus

Answer

Answer: d

---

41. Which of the following statements is correct about receptors? [NCERT Exemplar Problems]
(a) Gustatory receptors detect taste while olfactory receptors detect smell
(b) Both gustatory and olfactory receptors detect smell
(c) Auditory receptors detect smell and olfactory receptors detect taste
(d) Olfactory receptors detect taste and gustatory receptors smell

Answer

Answer: a

---

42. Which of the following is not associated with growth of plant? [NCERT Exemplar Problems]
(a) Auxin
(b) Gibberellins
(c) Cytokinins
(d) Abscisic acid

Answer

Answer: d

---

43. Involuntary actions in the body are controlled by [NCERT Exemplar Problems]
(a) medulla in forebrain
(b) medulla in midbrain
(c) medulla in hindbrain
(d) medulla in spinal cord

Answer

Answer: c

---

Direction (Q44 to Q48): In the following Questions, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
44. Assertion: Reflex Arc works faster than thinking process of brain.
Reason: Reflex Arc works in case of those animals who donot have thinking process.

Answer/Explanation

Answer: c
Explanation:
(c) Assertion is true but the Reason is false.

---

45. Assertion: Impulse travels from dendrite to cell body and then along the axon to its end.
Reason: Information acquired at the end of the dendrite tip of a nerve cell sets of an electric impulse.

Answer/Explanation

Answer: a
Explanation:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

---

46. Assertion: Brain is a delicate organ which is protected from injury.
Reason: The bony box protects the brain from any shock.

Answer/Explanation

Answer: c
Explanation:
(c) Assertion is true but the Reason is false.

---

47. Assertion: Plants do have a nervous system for control and coordination.
Reason: Plants use electro chemical means to convey information from cell to cell.

Answer/Explanation

Answer: d
Explanation:
(d) The statement of the Assertion is false but the Reason is true.

---

48. Assertion: On attaining puberty, breast size increases and reproductive organs develop in females.
Reason: Ovaries release hormone proges-terone in female.

Answer/Explanation

Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

---

49. The cells in our body that can be over a foot long are ____________ .

Answer/Explanation

Answer:
Explanation: nerve cells

---

50. The box enclosing the brain is called the ____________ .

Answer/Explanation

Answer:
Explanation: cranium

---

51. The lobes — parietal, temporal, frontal and occipital belong to ____________ .

Answer/Explanation

Answer:
Explanation: cerebrum

---

52. In a neuron, conversion of electrical signal to a chemical signal occurs at/in ____________ .

Answer/Explanation

Answer:
Explanation: axonal end

---

53. Posture and balance of the body is controlled by ____________ .

Answer/Explanation

Answer:
Explanation: cerebellum

---

54. The movement of shoot towards light is ____________ .

Answer/Explanation

Answer:
Explanation: phototropism

---

55. The movement of sunflower in accordance with the path of sun is due to ____________ .

Answer/Explanation

Answer:
Explanation: phototropism

---

56. Reflex action is an autonomic motor response without the involvement of brain. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

57. Insulin is given to the person suffering from goitre. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

58. Iodine is essential for the synthesis of thyroxine. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

59. Plants coordinate their behaviour against environmental changes by using plant hormones. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

60. The reaction to stimuli is a characteristic property of animals only. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

61. The shoots of a potted plant kept near the window bend towards sunlight because of negative phototropism. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

62. A cell or group of cells in a sense organ which is sensitive to a particular type of stimulus is called receptor. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

63. The hormone which is associated with female puberty is called testosterone. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

64. The job of the central nervous system is to collect all the information from all the receptors in our body [True/False]

Answer/Explanation

Answer:
Explanation: True

---

Direction (Q65 to Q66): Match Column I with Column II.
65.

Column I	Column II
(i) Neuron	(A) Short and branched
(ii) Cyton	(B) Elongated fibre
(iii) Dendrite	(C) Functional unit of nervous system.
(iv) Axon	(D) Contains nucleus and cytoplasm

Answer/Explanation

Answer:
Explanation:
(i) (C)
(ii) (D)
(iii) (A)
(iv) (B)

---

66.

Column I	Column II
(i) Photoreceptor	(A) Smell
(ii) Gustatoreceptor	(B) Sound
(iii) Olfactoreceptor	(C) Taste
(iv) Phonoreceptor	(D) Light

Answer/Explanation

Answer:
Explanation:
(i) (D)
(ii) (C)
(iii) (A)
(iv) (B)

---

67. Name two tissues that provide control and coordination in multicellular animals.

Answer/Explanation

Answer:
Explanation:
The two tissues that provide control and coordination in multicellular animals are nervous and endocrinal tissues.

---

68. Why do living organisms show movement?

Answer/Explanation

Answer:
Explanation:
To use changes in the environment to their advantage.

---

69. Mention the part of the body where gustatory and olfactory receptors are located. [CBSE 2012]

Answer/Explanation

Answer:
Explanation:
Gustatory receptors are located in Cerebrum of fore-brain. Olfactory receptors are located in Olfactory lobe of fore-brain.

---

70. State the function of:
(a) gustatory receptors, and
(b) olfactory receptors [CBSE 2013]

Answer/Explanation

Answer:
Explanation:
(a) Gustatory receptors receive taste.
(b) Olfactory receptors receive smell.

---

70. If we step on something sharp accidently, we move our foot away at once. What type of response is it?

Answer/Explanation

Answer:
Explanation:
Reflex action.

---

72. What is the significance of reflex action?

Answer/Explanation

Answer:
Explanation:
Reflex action enables the animal to respond quickly and relieves the brain from excess work.

---

73. Name the two components of central nervous systems in humans. [CBSE 2012, 2016]

Answer/Explanation

Answer:
Explanation:
The two components of Central Nervous System in human are brain and spinal cord.

---

74. How is the spinal cord protected in the human body?

Answer/Explanation

Answer:
Explanation:
Spinal cord is enclosed in a bony cage called vertebral column.

---

75. Mention the function of the hind-brain in humans.

Answer/Explanation

Answer:
Explanation:
Hind-brain coordinates the body movements and posture. It also controls respiration.

---

76. Which part of the brain is concerned with memory, will and power?

Answer/Explanation

Answer:
Explanation: Cerebral hemisphere.

---

77. Name the place of the human body where largest number of neurons are found.

Answer/Explanation

Answer:
Explanation: Human brain.

---

78. Name the part of the brain which is concerned with muscular coordination in the body.

Answer/Explanation

Answer:
Explanation: Cerebellum.

---

79. Which is the main coordinating centre of the body?

Answer/Explanation

Answer:
Explanation: Brain.

---

80. What are the different parts of the human brain?

Answer/Explanation

Answer:
Explanation:
Three major parts namely fore-brain, mid-brain and hind-brain.

---

81. Mention the components of fore-brain.

Answer/Explanation

Answer:
Explanation:
Cerebrum and olfactory lobes.

---

82. Do you know which part of the brain you use to think?

Answer/Explanation

Answer:
Explanation: Fore-brain.

---

83. Which part controls the involuntary actions such as coughing, sneezing and vomiting?

Answer/Explanation

Answer:
Explanation: Medulla of hind-brain.

---

84. Which part controls the voluntary actions?

Answer/Explanation

Answer:
Explanation: Cerebrum of fore-brain.

---

85. Which part of our brain is responsible for maintaining posture and balance of our body? [DoE]

Answer/Explanation

Answer:
Explanation: Cerebellum.

---

86. What are tropic movements? [DoE]

Answer/Explanation

Answer:
Explanation:
The movement which a plant makes in response to an external stimulus is called tropic.

---

87. What are nastic movements?

Answer/Explanation

Answer:
Explanation:
There are certain movements due to stimulus of certain movements due to stimulus of contact, light, heat, etc. Such movements are called nastic movements.

---

88. What are the different stimuli acting on plants?

Answer/Explanation

Answer:
Explanation:
Light, gravity, water and touch.

---

89. How do plants convey information?

Answer/Explanation

Answer:
Explanation:
By chemical coordination.

---

90. A young green plant receives sunlight from one direction only. What will happen to its shoots and roots?

Answer/Explanation

Answer:
Explanation:
Shoots will bend towards the light and roots away from the light.

---

91. A potted plant is made to lie horizontally on the ground. Which part of the plant will show
(a) positive geotropism?
(b) negative geotropism?

Answer/Explanation

Answer:
Explanation:
(a) Root
(b) Shoot

---

92. Why hormones are called as ‘chemical messengers’ ?

Answer/Explanation

Answer:
Explanation:
Hormones are carried in the blood streams to all parts of the body, so they are called ‘chemi¬cal messengers’.

---

93. Which gland is known as master gland? [DoE]

Answer/Explanation

Answer:
Explanation: Pituitary gland.

---

94. Why is pituitary called the master gland?

Answer/Explanation

Answer:
Explanation:
The pituitary gland controls the activity of other endocrine glands; so, it is called the master gland.

---

95. What are the functions of the Hypothalamus?

Answer/Explanation

Answer:
Explanation:
Hypothalamus regulates the secretion of hormones from pituitary gland.

---

96. What are endocrine glands?

Answer/Explanation

Answer:
Explanation:
Ductless glands which manufacture hormones and secrete them directly into the blood stream.

---

97. Why are endocrine glands called ductless glands?

Answer/Explanation

Answer:
Explanation:
Endocrine glands are called ductless glands because they do not have any external duct to discharge their secretions into the blood stream.

---

98. Where hypothalamus gland is located?

Answer/Explanation

Answer:
Explanation:
Hypothalamus gland is located in the brain.

---

99. Name the hormone which is associated with the metabolism of carbohydrates, proteins, calcium and phosphorus.

Answer/Explanation

Answer:
Explanation: Thyroxine.

---

100. Name the part of human body in which the adrenal and pituitary glands are located.

Answer/Explanation

Answer:
Explanation:
Adrenal – Above kidney and
Pituitary – Brain.

---

101. Name one gland in human body which secretes digestive enzymes as well as hormones.

Answer/Explanation

Answer:
Explanation: Pancreas

---

102. Name the glands which secrete estrogen and progesterone.

Answer/Explanation

Answer:
Explanation: Ovaries

---

103. Name the hormone that regulates blood sugar level. [DoE]

Answer/Explanation

Answer:
Explanation: Insulin.

---

104. Name the plant hormones which help/ promote
(a) cell division
(b) growth of the stem.

Answer/Explanation

Answer:
Explanation:
The plant hormones which help or promote:
(a) Cell division — Cytokinins
(b) Growth of the stem — Gibberellins

---

105. Name one plant growth hormone which retards growth during extremely dry season.

Answer/Explanation

Answer:
Explanation: Abscisic acid

---

106. Give an example of a plant hormone that promotes its grow th. W’here is it synthesized? [CBSE 2014]

Answer/Explanation

Answer:
Explanation:
Auxin promotes growth. It is synthesised at the shoot tip of the plant body.

---

107. Name one organ where growth hormone is synthesized in case of plants and man.

Answer/Explanation

Answer:
Explanation:
Shoot tip in plants and pituitary gland (anterior) in man.

---

108. What will happen to a plant shoot if sunlight falls on it from one direction only?

Answer/Explanation

Answer:
Explanation:
The shoot will bend towards light.

---

109. What name is given to chemical substances which bring about control and coordination in plants?

Answer/Explanation

Answer:
Explanation: Plant hormone.

---

Fill in the Blanks

1. Control and coordination are the functions of the nervous system and ……… in our body.
2. The nervous system uses ……… impulses to transmit messages.
3. Central nervous system consists of ……… and ……… .
4. Largest part of the brain is ……… .
5. Defeciency of ……… hormone in childhood leads to dwarfism in humans.
6. The growth of pollen tubes towards the ovules is the result of a ……… movement.

Answers

1. hormones
2. electrical
3. brain, spinal cord
4. cerebrum
5. growth
6. chemotropic

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Free PDF Download of CBSE Class 10 Science Chapter 6 Life Process Multiple Choice Questions with Answers. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 10 Science Life Process Multiple Choice Questions with Answers to know their preparation level.

Class 10 Science MCQs Chapter 6 Life Process

1. Which of the following are energy foods?
(a) Carbohydrates and fats
(b) Proteins and mineral salts
(c) Vitamins and minerals
(d) Water and roughage

Answer

Answer: a

---

2. In which mode of nutrition an organism de-rives its food from the body of another living organism without killing it?
(a) Saprotrophic nutrition
(b) Parasitic nutrition
(c) Holozoic nutrition
(d) Autotrophic nutrition

Answer

Answer: b

---

3. The mode of nutrition found in fungi is:
(a) Parasitic nutrition
(b) Holozoic nutrition
(c) Autotrophic nutrition
(d) Saprotrophic nutrition

Answer

Answer: d

---

4. Roots of the plants absorb water from the soil through the process of:
(a) diffusion
(b) transpiration
(c) osmosis
(d) None of these

Answer

Answer: c

---

5. The site of photosynthesis in the cells of a leaf is
(a) chloroplast
(b) mitochondria
(c) cytoplasm
(d) protoplasm

Answer

Answer: a

---

6. In amoeba, food is digested in the:
(a) food vacuole
(b) mitochondria
(c) pseudopodia
(d) chloroplast

Answer

Answer: a

---

7. Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva?
(a) Starch breaking down into sugars.
(b) Proteins breaking down into amino acids.
(c) Absorption of vitamins.
(d) Fats breaking down into fatty acids and glycerol.

Answer

Answer: a

---

8. Which region of the alimentary canal absorbs the digested food?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Liver

Answer

Answer: b

---

9. The contraction and expansion movement of the walls of the food pipe is called:
(a) translocation
(b) transpiration
(c) peristaltic movement
(d) digestion

Answer

Answer: c

---

10. When a few drops of iodine solution are added to rice water, the solution turns blue- black in colour. This indicates that rice water contains:
(a) fats
(b) complex proteins
(c) starch
(d) simple proteins

Answer

Answer: c

---

11. The exit of unabsorbed food material is regu-lated by
(a) liver
(b) anus
(c) small intestine
(d) anal sphincter

Answer

Answer: d

---

12. What are the products obtained by anaerobic respiration in plants?
(a) Lactic acid + Energy
(b) Carbon dioxide + Water + Energy
(c) Ethanol + Carbon dioxide + Energy
(d) Pyruvate

Answer

Answer: c

---

13. The breakdown of pyruvate to give carbon di-oxide, water and energy takes place in
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus

Answer

Answer: b

---

14. Glycolysis process occurs in which part of the cell?
(a) Cytoplasm
(b) Nucleus
(c) Mitochondria
(d) Chloroplast

Answer

Answer: a

---

15. Name the substances whose build up in the muscles during vigorous physical exercise may cause cramps?
(a) Ethanol + Carbon dioxide + Energy
(b) Lactic acid + Energy
(c) Carbon dioxide + Water + Energy
(d) Pyruvate

Answer

Answer: b

---

16. Name the pores in a leaf through which respi-ratory exchange of gases takes place.
(a) Lenticels
(b) Vacuoles
(c) Xylem
(d) Stomata

Answer

Answer: d

---

17. The respiratory pigment in human beings is:
(a) carotene
(b) chlorophyll
(c) haemoglobin
(d) mitochondria

Answer

Answer: c

---

18. Which plant tissue transports water and min-erals from the roots to the leaf?
(a) Xylem
(b) Phloem
(c) Parenchyma
(d) Collenchyma

Answer

Answer: a

---

19. The movement of food in phloem is called:
(a) transpiration
(b) translocation
(c) respiration
(d) evaporation

Answer

Answer: b

---

20. A blood vessel which pumps the blood from the heart to the entire body:
(a) artery
(b) capillary
(c) Vein
(d) Haemoglobin

Answer

Answer: a

---

21. Name a circulatory fluid in the human body other than blood.
(a) Platelets
(b) RBC
(c) Lymph
(d) Plasma

Answer

Answer: c

---

22. Single circulation, i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by which of the following:
(a) hyla, rana, draco
(b) whale, dolphin, turtle
(c) labeo, chameleon, salamander
(d) hippocampus, exocoetus, anabas

Answer

Answer: d

---

23. Name the tube which connects the kidneys to the urinary bladder.
(a) Urethra
(b) Nephron
(c) Tubule
(d) Ureter

Answer

Answer: d

---

24. Which part of nephron allows the selective reabsorption of useful substances like glucose, amino acids, salts and water into the blood capillaries?
(a) Tubule
(b) Glomerulus
(c) Bowman’s capsule
(d) Ureter

Answer

Answer: a

---

25. Where is the dirty blood in our body filtered?
(a) Heart
(b) Lungs
(c) Ureter
(d) Kidneys

Answer

Answer: d

---

26. The procedure used for cleaning the blood of a person by separating urea from it is called:
(a) osmosis
(b) filtration
(c) dialysis
(d) double circulation

Answer

Answer: c

---

27. Which is the correct sequence of body parts in the human alimentary canal?
(a) Mouth → stomach → small intestine → large intestine → oesophagus
(b) Mouth → oesophagus → stomach → small intestine → large intestine
(c) Mouth → stomach → oesophagus → smallintestine → large intestine
(d) Mouth → oesophagus → stomach → large intestine → small intestine

Answer

Answer: b

---

28. Identify the correct path of urine in the human body.
(a) Kidney → urinary bladder → urethra → ureter
(b) Urinary bladder → ureter → kidney → urethra
(c) Kidney → ureter → urethra → urinary bladder
(d) Kidney → ureter → urinary bladder → urethra

Answer

Answer: d

---

29. Autotrophic organisms include
(a) bacteria and virus
(b) bacteria and fungi
(c) green plants and some bacteria
(d) green plants and all bacteria

Answer

Answer: c

---

30. A gland not associated with the alimentary canal is
(a) liver
(b) salivary glands
(c) pancreas
(d) adrenal

Answer

Answer: d

---

31. Which of the following are chiefly digested in the stomach?
(a) Carbohydrates
(b) Proteins
(c) Lipids
(d) Fats

Answer

Answer: b

---

32. From the given picture of the digestive system, identify the part labelled as gastric gland.

(a) A
(b) B
(c) C
(d) D

Answer

Answer: b

---

33. Large intestine in man mainly carries out
(a) absorption
(b) assimilation
(c) digestion of fats
(d) digestion of carbohydrates

Answer

Answer: a

---

34. The part of the digestive system where no digestion takes place is
(a) ileum
(b) stomach
(c) mouth
(d) oesophagus

Answer

Answer: d

---

35. The fermentation of glucose by yeast normally yields
(a) alcohol, CO₂ and 36 ATP
(b) CO₂, H₂0 and 36 ATP
(c) alcohol, CO₂ and 2ATP
(d) lactic acid, CO₇ and 2 ATP

Answer

Answer: d

---

36. A large quantity of one of the following is removed from our body by lungs:
(a) CO₂ and H₂0
(b) CO₂ only
(c) FLO only
(d) ammonia

Answer

Answer: a

---

37. In respiration, air passes through
(a) Pharynx → nasal cavity → larynx → trachea bronchi → bronchioles
(b) Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles
(c) Larynx → nasal cavity’ → pharynx → trachea
(d) Larynx → pharynx trachea → lungs

Answer

Answer: b

---

38. A biochemical compound that readily combines with oxygen and distributes it throughout the human body is
(a) water
(b) urea
(c) haemoglobin
(d) acetylcholine

Answer

Answer: c

---

39. The process in which loss of water takes place in the form of water vapour through stomata is called
(a) transportation
(b) transpiration
(c) guttation
(d) translocation

Answer

Answer: b

---

40. In a closed circulatory system, blood is completely enclosed within
(a) vessels
(b) heart
(c) skeleton
(d) sinuses

Answer

Answer: b

---

41. Normal blood pressure (systolic/diastolic) is
(a) 120/80 mm of Hg
(b) 160/80 mm of Hg
(c) 120/60 mm of Hg
(d) 180/80 mm of Hg

Answer

Answer: a

---

42. Blood pressure is measured by an instrument called
(a) barometer
(b) sphygmomanometer
(c) photometer
(d) manometer

Answer

Answer: b

---

43. Which of the following statements is not correct?
(a) Deoxygenated blood is poured into right atrium of heart.
(b) The excretory units of flatworms are flame cells.
(c) Human kidney has about 1 million nephridia
(d) Tracheids and vessels are non-living conducting tissues.

Answer

Answer: c

---

44. Which part of alimentary canal receives bile from the liver? [NCERT Exemplar Problems]
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Oesophagus

Answer

Answer: b

---

45. When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of [NCERT Exemplar Problems]
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour

Answer

Answer: b

---

46. The filtration units of kidneys are called [NCERT Exemplar Problems]
(a) ureter
(b) urethra
(c) neurons
(d) nephrons

Answer

Answer: d

---

47. Oxygen liberated during photosynthesis comes from [NCERT Exemplar Problems]
(a) water
(b) chlorophyll
(c) carbon dioxide
(d) glucose

Answer

Answer: a

---

48. The opening and closing of the stomatal pore depends upon [NCERT Exemplar Problems]
(a) oxygen
(b) temperature
(c) water in guard cells
(d) concentration of CO₂ in stomata

Answer

Answer: c

---

Direction (Q49 to Q53): In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
49. Assertion: When air is passed through lime water, lime water turns milky.
Reason: Air contains 78% nitrogen and 21% oxygen.

Answer/Explanation

Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

---

50. Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure.

Answer/Explanation

Answer: a
Explanation:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

---

51. Assertion: Human being has a complex respiratory system.
Reason: Human skin is impermeable to gases.

Answer/Explanation

Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

---

52. Assertion: All proteins in our food are digested in small intestine only.
Reason: The protein digesting enzymes are released onto small intestine.

Answer/Explanation

Answer: d
Explanation:
(d) The statement of the Assertion is false but the Reason is true.

---

53. Assertion: Human heart does not allow mixing of oxygen reach blood with carbon dioxide reach blood.
Reason: Human heart has different chambers.

Answer/Explanation

Answer: a
Explanation:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

---

54. The _____________ is where the respiratory and digestive passage come together.

Answer/Explanation

Answer:
Explanation: pharynx

---

55. The conditions necessary for photosynthe-sis to take place are _____________ , _____________ , _____________ and _____________ .

Answer/Explanation

Answer:
Explanation: sunlight, chlorophyll, carbon dioxide and water

---

56. The process in which the digested food passes through the intestinal wall into blood stream is called ________ .

Answer/Explanation

Answer:
Explanation: absorption

---

57. The teeth covered with a sticky, yellowish layer of food particles and bacteria is called _____________ .

Answer/Explanation

Answer:
Explanation: plaque

---

58. Iodine turns blue-black on reacting with _____________ .

Answer/Explanation

Answer:
Explanation: starch

---

59. The energy produced during respiration is stored in the form of ATP which stands for _____________ .

Answer/Explanation

Answer:
Explanation: Adenosine Tri-phosphate

---

60. Pyruric acid is a three carbon compound which is also known as _____________ .

Answer/Explanation

Answer:
Explanation: pyruvate

---

61. The rate of breathing in _____________ animals in much faster than in _____________ animals.

Answer/Explanation

Answer:
Explanation: aquatic, terriestial

---

62. The actual exchange of gases takes place in the _____________ of the lungs.

Answer/Explanation

Answer:
Explanation: alveoli

---

63. _____________ are long, thin, spindle shaped cell with pits in their thick cell walls.

Answer/Explanation

Answer:
Explanation: Tracheids

---

64. The liqid part of blood is called _____________ .

Answer/Explanation

Answer:
Explanation: plasma

---

65. The expansion of an artery each time the blood is forced into it, is called _____________ .

Answer/Explanation

Answer:
Explanation: pulse

---

66. Gums and resins are the _____________ products of plants.

Answer/Explanation

Answer:
Explanation: waste

---

Direction (Q67 to Q68): Match Column I with Column II.
67.

Column I	Column II
Animal	Respiratory Organ
(i) Fish	(A) Trachea
(ii) Birds	(B) Gills
(iii) Aquatic Arthropoda	(C) Lungs
(iv) Earthworm	(D) Moist cuticle

Answer/Explanation

Answer:
Explanation:
(i) (B)
(ii) (C)
(iii) (A)
(iv) (D)

---

68.

Column I	Column II
Region of digestive system	Digestive juice
(A) Mouth	(i) Pancreatic juice
(B) Stomach	(ii) Intestinal juice
(C) Duodenum	(iii) Gastric juice
(D) Small intestine	(iv) Saliva

Answer/Explanation

Answer:
Explanation:
(A) (iv)
(B) (iii)
(C) (i)
(D) (ii)

---

69. Glomerulus acts as a dialysis bag. [True/ False]

Answer/Explanation

Answer:
Explanation: True

---

70. Bowman’s capsule is found in heart. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

71. Peristaltic movement of muscles occurs in the mouth to push food into alimentary canal. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

72. The release of energy in aerobic process is less than in anaerobic process. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

73. Before testing for starch, chlorophyll has to be removed from the leaf as it interferes in the test for starch due to its green colour. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

74. The process in which the absorbed food is taken in by body cells and used for energy, growth and repair is called egestion. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

75. The length of small intestine in a human adult is about 3.5 m. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

76. Carbohydrates are the components of our food which is digested by an enzyme which is present in saliva as well as in pancreatic juice. [True/False]

Answer/Explanation

Answer:
Explanation: True

---

77. Cytoplasm are the sites of aerobic respiration in the cells. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

78. The respiration in plants occurs at a fast rate whereas the respiration in animals occur at a much slower rate. [True/False]

Answer/Explanation

Answer:
Explanation: False

---

79. What do you mean by life processes?

Answer/Explanation

Answer:
Explanation:
Processes which perform maintenance job in our body.

---

80. Name the activity of living beings which considered as indication of life?

Answer/Explanation

Answer:
Explanation: Movement.

---

81. Name the basic requirement of living organisms needed to obtain energy.

Answer/Explanation

Answer:
Explanation: Food

---

82. Name the process by which plants prepare food.

Answer/Explanation

Answer:
Explanation: Photosynthesis

---

83. Mention the raw materials required for photosynthesis. [CBSE 2014]

Answer/Explanation

Answer:
Explanation:
The raw materials required for photosynthesis are carbon dioxide and water in presence of sunlight and chlorophyll.

---

84. Name four nutrients needed by the plants which are taken up from the soil.

Answer/Explanation

Answer:
Explanation:
Nitrogen, phosphorus, iron, and magnesium.

---

85. Name the cell organelle in which photosynthesis occur. [DoE]

Answer/Explanation

Answer:
Explanation: Chloroplast

---

86. Name the green pigment present in the leaves of a plant.

Answer/Explanation

Answer:
Explanation: Chlorophyll.

---

87. In the experiment “Light is essential for photosynthesis”, why does the uncovered part of the leaf turn blue-black after putting iodine solution? [HOTS]

Answer/Explanation

Answer:
Explanation:
Starch is produced in the uncovered part of the leaf due to photosynthesis which turns blue-black in presence of iodine solution.

---

88. Name a unicellular organism which uses cilia to move food particles into its mouth.

Answer/Explanation

Answer:
Explanation: Paramoecium.

---

89. Mention how organisms like bread moulds and mushrooms obtain their food.

Answer/Explanation

Answer:
Explanation:
Organisms like bread moulds and mushrooms break down the food materials outside the body and then absorb it.

---

90. Classify the followings as saprotrophs or parasites:
leech, yeast, mushroom

Answer/Explanation

Answer:
Explanation:
Saprotrophs : yeast, mushroom
Parasites : leech

---

91. Which enzyme present in saliva breaks down starch?

Answer/Explanation

Answer:
Explanation:
The saliva contains an enzyme called salivary amylase that breaks down starch.

---

92. Why does our mouth ‘water’ when we see or eat a food which we really like?

Answer/Explanation

Answer:
Explanation:
Due to the production of saliva by the salivary glands in the mouth.

---

93. Why does bread taste sweet on mastication?

Answer/Explanation

Answer:
Explanation:
Salivary amylase act on starch of food and change it into a sweet sugar called maltose.

---

94. Which pancreatic enzyme is effective in digesting proteins?

Answer/Explanation

Answer:
Explanation:
Trypsin is the pancreatic enzyme which is effective in digesting proteins.

---

95. Where does digestion of fat take place in our body?

Answer/Explanation

Answer:
Explanation:
Digestion of fat takes place in the small intestine of our body.

---

96. What is alimentary canal?

Answer/Explanation

Answer:
Explanation:
It is a long tube extending from mouth to anus in which digestion and absorption of food takes place.

---

97. Define peristaltic movement? [DoE]

Answer/Explanation

Answer:
Explanation:
Peristaltic movement is defined as contraction and relaxation of muscles in the food pipe . which brings food down the pipe into the stomach.

---

98. Name the longest part of the alimentary canal.

Answer/Explanation

Answer:
Explanation:
Small intestine.

---

99. What is emulsification? [DoE]

Answer/Explanation

Answer:
Explanation:
Breakdown of large gloubule fats into smaller fats droplets is known as emulsification.

---

100. What is the name given to the biological catalyst which speed up the chemical reactions taking place in cells.

Answer/Explanation

Answer:
Explanation: Enzymes.

---

101. Name the muscle which regulates the exit of food from stomach to small intestine.

Answer/Explanation

Answer:
Explanation: Sphincter muscle.

---

102. How does the acidic medium in the small intestine is converted into alkaline for pancreatic enzymes?

Answer/Explanation

Answer:
Explanation: By the action of bile juice secreted by liver.

---

103. In which part of alimentary canal digestion does not occur?

Answer/Explanation

Answer:
Explanation: Large intestine

---

104. Name the structure which regulates the exit of waste material.

Answer/Explanation

Answer:
Explanation: Anal sphincter.

---

105. State the basic difference between the process of respiration and photosynthesis.

Answer/Explanation

Answer:
Explanation:
Respiration uses O₂ and releases CO₂ but in photosynthesis, CO₂ is used and O₂ is released.

---

106. Name the pigment present in human which aids in respiration.

Answer/Explanation

Answer:
Explanation: Haemoglobin.

---

107. Give one point which is common for both aerobic and anaerobic respiration.

Answer/Explanation

Answer:
Explanation:
In both aerobic and anaerobic respiration, the chemical used is glucose.

---

108. Why is anaerobic respiration less efficient?

Answer/Explanation

Answer:
Explanation:
Anaerobic respiration is the incomplete breakdown of glucose and produces less energy, so it is less efficient.

---

Fill in the Blanks
1. The exit of food from the stomach is regulated by a ………. muscle.
2. ………. is the longest part of the alimentary canal.
3. The process of breakdown of glucose, (a six-carbon molecule) into pyruvate, (a three-carbon molecule), takes place in the ………. .
4. ………. is the site of the complete digestion of carbohydrates, proteins and fats.
5. Breaking of pyruvate using oxygen takes place in the ………. .
6. Rings of cartilage are present in the wind pipe to ensure that the ………. .
7. The blood has ………. cells which plug the leakage in the vessels by helping to clot the blood at the point of injury.
8. ………. transports products of photosynthesis from the leaves to other parts of the plant.

Answers
1. sphincter
2. Small intestine
3. cytoplasm
4. Small intestine
5. mitochondria
6. air-passage does not collapse
7. platelet
8. phloem

We hope the given MCQ Questions for Class 10 Science Life Process with Answers will help you. If you have any query regarding CBSE Class 10 Science Chapter 6 Life Process Multiple Choice Questions with Answers, drop a comment below and we will get back to you at the earliest.

Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 1 Reproduction in Organisms. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Biology Reproduction in Organisms MCQs Pdf with Answers to know their preparation level.

Reproduction in Organisms Class 12 Biology MCQs Pdf

1. The terms homothallic and monoecious are used to denote
(a) unisexual condition
(b) bisexual condition
(c) staminate flowers
(d) pistillate flowers.

Answer

Answer: b

---

2. The most significant feature of vegetative propagation is that
(a) it is a method of producing a large number of individuals genetically identical to the parent.
(b) it is a method of producing a large number of individuals genetically different from the parent.
(c) it ensures that the progeny individuals are resistant to diseases and pests.
(d) it is an age old practice.

Answer

Answer: a

---

3. In animals, juvenile phase is followed by,
(a) reproductive phase
(b) senescent phase
(c) old age
(d) vegetative phase.

Answer

Answer: a

---

4. External fertilisation occurs in majority of
(a) fungi
(b) liverworts
(c) algae
(d) mosses

Answer

Answer: c

---

5. Vegetative propagation in Pistia occurs by
(a) sucker
(b) offset
(c) runner
(d) rhizome

Answer

Answer: b

---

6. Sugarcane is propagated by
(a) stem cutting
(b) leaf buds
(c) root cutting
(d) seeds

Answer

Answer: a

---

7. A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has [NCERT Exemplar]
(a) haploid vegetative cells and diploid gametangia
(b) diploid vegetative cells and diploid gametangia
(c) diploid vegetative cells and haploid gametangia
(d) haploid vegetative cells and haploid gametangia

Answer

Answer: d

---

8. Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because [NCERT Exemplar]
(a) sexual reproduction is a lengthy process
(b) gametes of parents have qualitatively different genetic composition
(c) genetic material comes from parents of two different species
(d) greater amount of DNA is involved in sexual reproduction.

Answer

Answer: b

---

9. There is no natural death in single celled organisms like Amoeba and bacteria because [NCERT Exemplar]
(a) they cannot reproduce sexually
(b) they reproduce by binary fission
(c) parental body is distributed among the offspring
(d) they are microscopic

Answer

Answer: c

---

10. There are various types of reproduction. The type of reproduction adopted by an organism depends on [NCERT Exemplar]
(a) the habitat and morphology of the organism
(b) morphology of the organism
(c) morphology and physiology of the organism
(d) the organism’s habitat, physiology, and genetic makeup

Answer

Answer: d

---

11. Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because [NCERT Exemplar]
(a) nodes are shorter than intemodes
(b) nodes have meristematic cells
(c) nodes are located near the soil
(d) nodes have non-photosynthetic cells

Answer

Answer: b

---

12. Identify the correct sequence of events.
(a) Gametogenesis → Syngamy Embryogenesis → Zygote
(b) Gametogenesis → Zygote → Syngamy → Embryogenesis
(c) Gametogenesis → Embryogenesis → Zygote → Syngamy
(d) Gametogenesis → Syngamy → Zygote

Answer

Answer: d

---

13. Development of unfertilised ovum into a new individual is called ____ .

Answer/Explanation

Answer:
Explaination: Parthenogenesis.

---

14. Earthworms and sponges are _____ animals.

Answer/Explanation

Answer:
Explaination: Bisexual/Hermaphrodite.

---

15. Gametogenesis and gamete transfer are _____ events.

Answer/Explanation

Answer:
Explaination: Pre-fertilisation.

---

16. ____ cycle occurs in non-primate mammals like cows and dogs.

Answer/Explanation

Answer:
Explaination: Oestrous.

---

17. _____ are the motile microscopic structures produced by many algal species.

Answer/Explanation

Answer:
Explaination: Zoospores.

---

18. Vegetative reproduction in plants is a method of _____ reproduction.

Answer/Explanation

Answer:
Explaination: Asexual.

---

19. ____ results in the formation of zygote.

Answer/Explanation

Answer:
Explaination: Syngamy.

---

20. In oviparous animals like reptiles and birds, the fertilised egg is covered by a _____ shell and laid in a safe place.

Answer/Explanation

Answer:
Explaination: Calcareous.

---

21. _____ is the vital link that ensures continuity between one generation to the next.

Answer/Explanation

Answer:
Explaination: Zygote.

---

22. The offspring of ____ animals are vulnerable to predators.

Answer/Explanation

Answer:
Explaination: Oviparous.

---

23. Match the asexual reproductive structures in Column I with the organisms in Column II.

Column I	Column II
A. Conidia	1. Chiamydomonas
B. Gemmules	2. Hydra
C. Zoospores	3. Penicillium
D. Buds	4. Sponges
	5. Banana

Answer/Explanation

Answer:
Explaination: A – 3, B – 4, C – 1, D – 2

---

24. Match the terms in Column I with the organisms in Column II.

Column I	Column II
A. Fragmentation	1. Pistia
B. Binary fission	2. Spirogyra
C. Bulbils	3. Saccharomyces
D. Budding	4. Paramoecium
	5. Agave

Answer/Explanation

Answer:
Explaination: A – 2, B – 4, C – 5, D – 3

---

25. In papaya and date palm, both male and female flowers are present on the same plant. [True/False]

Answer/Explanation

Answer:
Explaination: False.

---

26. Mitotic cell divisions occur during embryo-genesis. [True/False]

Answer/Explanation

Answer:
Explaination: True.

---

27. Plants produced through vegetative propagation are called clones. [True/False]

Answer/Explanation

Answer:
Explaination: True.

---

28. Bony fishes, bryophytes and pteridophytes show internal fertilisation. [True/False]

Answer/Explanation

Answer:
Explaination: False.

---

29. Gametes are always haploid and gametogenesis always involves meiosis. [True/False]

Answer/Explanation

Answer:
Explaination: False.

---

Directions (Q30 to Q34): Mark the odd one in each of the following groups.

30. Earthworms, Sponges, Cockroaches, Tapeworms.

Answer/Explanation

Answer:
Explaination: Cockroaches.

---

31. FUCHS, Cladophora, Funaria, Homo sapiens

Answer/Explanation

Answer:
Explaination: Cladophora.

---

32. Turkey, Honey bees, Camels, Rotifers

Answer/Explanation

Answer:
Explaination: Camels.

---

33. Bony fishes, Reptiles, Birds, Bryophytes

Answer/Explanation

Answer:
Explaination: Bony fishes.

---

34. Reptiles, Monkeys, Birds, Frogs

Answer/Explanation

Answer:
Explaination: Frogs.

---

35. Name the biological process that enables continuity of species. [Delhi 2012C]

Answer/Explanation

Answer:
Explaination: Reproduction.

---

36. Define reproduction.

Answer/Explanation

Answer:
Explaination: Reproduction is defined as the biological process, in which an organism gives rise to young ones similar to itself.

---

37. Name the mode of reproduction that helps in producing genetically identical offspring. [Delhi 2012C]

Answer/Explanation

Answer:
Explaination: Asexual reproduction.

---

38. Offspring derived by asexual reproduction are called clones. Justify giving two reasons. [AI 2010; HOTS]

Answer/Explanation

Answer:
Explaination: (i) They are genetically and morphologically identical among themselves.
(ii) They are also genetically and morphologically identical to the parent.

---

39. Name an organism where cell division in itself is a mode of reproduction. [AI 2013; Foreign 2010]

Answer/Explanation

Answer:
Explaination: Amoeba, Paramoecium (any one)

---

40. Name the type of asexual reproduction, where the parent cell ceases to exist. [Delhi 2017C]

Answer/Explanation

Answer:
Explaination: Binary fission.

---

41. Which ones of the following organisms exhibit binary fission?
Bacillus, Penicillium, Yeast, Amoeba. [AI 2012C]

Answer/Explanation

Answer:
Explaination: Bacillus and Amoeba

---

42. Provide an example of each of single-celled organisms, which reproduce by:
(i) binary fission, (ii) budding. [Delhli 2017C]

Answer/Explanation

Answer:
Explaination: (i) Amoeba/Paramoecium
(ii) Yeast.

---

43. Which of the following statements is true of yeast?
(a) The cell divides by binary fission. One of them develops into a bud.
(b) The cell divides unequally. The smaller cell develops into a bud.
(c) The cell produces conidia, which develop into a bud. [Delhi 2013C]

Answer/Explanation

Answer: b
Explaination: (b) is true of yeast.

---

44. Name the organism and the mode of reproduction represented in the diagram given below. [AI 2010C]

Answer/Explanation

Answer:
Explaination: – Yeast
– Budding.

---

45. In yeast and Amoeba, the parent cell divides to give rise to two new individual cells. How does the cell division differ in these two organisms? [Foreign 2010; HOTS]

Answer/Explanation

Answer:
Explaination: – In yeast, the cell division is unequal; the small cell grows into a bud, which remains attached to the large cell in the initial stages, but gets separated later.
– In Amoeba, the cell reproduces by binary fission, where the cell divides into two halves and each one grows rapidly into an adult.

---

46. Write one difference between binary fission and budding. [Delhi 2017C]

Answer/Explanation

Answer:
Explaination:

---

47. Under unfavourable conditions, Amoeba shows encystation. What does it mean?

Answer/Explanation

Answer:
Explaination: Under unfavourable conditions, Amoeba withdraws its pseudopodia and develops a three-layered thick wall called cyst around it; this process is called encystation.

---

48. Give one example each of a fungus, which reproduces by: [AI 2014C]
(a) budding
(b) conidia

Answer/Explanation

Answer:
Explaination: (a) Yeast
(b) Penicillium

---

49. Name an alga that reproduces asexually through zoospores. Why are these reproductive units so called? [AI 2013]

Answer/Explanation

Answer:
Explaination: Chlamydomonas. The zoospores are motile (like animals).

---

50. Identify the reproductive structure and name the organism they are being released from. [Delhi 2010C]

Answer/Explanation

Answer:
Explaination: – Zoospores
– Chlamydomonas

---

51. Mention a characteristic feature and a function of zoospores in some algae. [AI 2010]

Answer/Explanation

Answer:
Explaination: – Zoospores are microscopic, thin-walled and motile with flagella.
– They are meant for asexual reproduction.

---

52. How does Penicillium reproduce asexually? [Delhi 2011]

Answer/Explanation

Answer:
Explaination: Penicillium reproduces asexually by forming conidia.

---

53. Name the respective asexual reproductive structures of Yeast and Sponge. [AI 2012C]

Answer/Explanation

Answer:
Explaination: Yeast – Buds
Sponge – Gemmules

---

54. Which of the following statements is true of Hydra? [AI 2013C]
(a) It produces asexual gemmules.
(b) It produces unicellular bud.
(c) It produces multicellular bud.

Answer/Explanation

Answer: c
Explaination: (c) is true of Hydra

---

55. How is the phenomenon regeneration useful to a lizard?

Answer/Explanation

Answer:
Explaination: A lizard can discard a part of its tail, when in danger and it is regenerated later.

---

56. Name the vegetative propagules in the following: [AI 2014]
(a) Agave
(b) Bryopbyllum

Answer/Explanation

Answer:
Explaination: (a) Bulbils
(b) Leaf buds.

---

57. Give one example each of a plant that reproduces by
(a) runner
(b) offset

Answer/Explanation

Answer:
Explaination: (a) Grasses
(b) Water hyacinth.

---

58. Write the name of the organism that is referred to as the ‘Terror of Bengal’ [Delhi 2014]

Answer/Explanation

Answer:
Explaination: Water hyacinth.

---

59. Identify the picture and mention the vegetative part that helps it to propagate. [AI 2015C]

Answer/Explanation

Answer:
Explaination: – It is rhizome (modified stem) of ginger.
– Rhizome is the vegetative propagule, the buds in it help it to propagate.

---

60. Identify ‘A’ in the given diagram and state its function [Delhi 2016C]

Answer/Explanation

Answer:
Explaination: – ‘A’ shows the nodes of the rhizome of ginger.
– The buds arising from the nodes produce new plants, i.e., vegetative propagation.

---

61. Which of the following statements is true of ginger? [AI 2013C]
(a) Germinating bud appears from the eye of the stem tuber.
(b) Germinating bud appears from the node of the rhizome.
(c) Germinating bud appears from the notch of the leaf margin.

Answer/Explanation

Answer: b
Explaination:  (b) is true of Ginger

---

62. Why do intemodal segments of sugarcane fail to propagate vegetatively, even when they are in contact with damp soil? [CBSE Sample Paper 2010; HOTS]

Answer/Explanation

Answer:
Explaination: The plantlets arise from the buds present on the nodes; only when the nodes come in contact with the damp soil, will they produce roots and shoots and not from internodal segments.

---

63. Name the vegetative propagules in [Foreign 2017]
(i) Potato and
(ii) Pistia.

Answer/Explanation

Answer:
Explaination: (i) ‘Eyes’ (buds) in the tuber
(ii) Offset.

---

64. Name the units of vegetative propagation in grasses and water hyacinth. [AI 2012C]

Answer/Explanation

Answer:
Explaination: Grasses – Runner
Water hyacinth – Offset

---

65. Identify ‘A’ in the diagram and mention its function. [Delhi 2016 C]

Answer/Explanation

Answer:
Explaination: – ‘A’ is the offset of water hyacinth.
– It is the vegetative propagule that helps it to propagate.

---

66. Which of the following statements is true of Bryophyllum? [Delhi 2013C]
(a) Germinating bud appears from the eye of the stem tuber.
(b) Germinating bud appears from the node of the rhizome.
(c) Geminating bud appears from the notch at the leaf margin.

Answer/Explanation

Answer: c
Explaination: (c) is true of Bryophyllum.

---

67. Identify ‘A’ in the diagram and mention its function. [Delhi 2016C]

Answer/Explanation

Answer:
Explaination: – ‘A’ represents the leaf buds on a leaf of Bryophyllum.
– The leaf buds produce plantlets when the leaf falls and comes in contact with damp soil.

---

68. Name the mode of reproduction that ensures the creation of new variants, [Delhi 2012C]

Answer/Explanation

Answer:
Explaination: Sexual reproduction.

---

69. Name the phase, all organisms have to pass through before they can reproduce sexually. [AI 2011]

Answer/Explanation

Answer:
Explaination: Juvenile phase (vegetative phase in plants)

---

70. What marks the end of juvenile phase in flowering plants?

Answer/Explanation

Answer:
Explaination: Initiation of floral buds marks the end of juvenile phase in flowering plants.

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71. Name the two groups of plants which show clear cut vegetative, reproductive and senescent phases.

Answer/Explanation

Answer:
Explaination: Annual and biennial plants.

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72. Mention the unique flowering phenomenon exhibited by Strobilanthus kunthiana (neelakurinji). [Delhi 2012]

Answer/Explanation

Answer:
Explaination: This plant flowers once in twelve years.

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73. Mention the unique feature with respect to flowering and fruiting in bamboo species. [Delhi 2012]

Answer/Explanation

Answer:
Explaination: Bamboo flowers only once in its life time, generally after 50-100 years. It produces a large number of fruits and seeds and dies.

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74. Name two animals that exhibit oestrous cycle. [Foreign 2016]
Or
Give an example of an animal that exhibits oestrous cycle. [AI 2014C]

Answer/Explanation

Answer:
Explaination: Cows/Sheep/Rats/Dogs/Deers/Tiger.

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75. Write the two pre-fertilisation events from the list given below: Syngamy, Gametogenesis, Embryogenesis, Pollination. [Delhi 2014C]

Answer/Explanation

Answer:
Explaination: Gametogenesis and pollination.

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76 Which one of the following statements is true of Cucurbits?
(a) It is monoecious producing both staminate and pistillate flowers in the same plant.
(b) It is monoecious producing staminate and pistillate flowers in two different plants.
(c) It is dioecious producing staminate flowers in one plant and pistillate flowers in another. [Delhi 2013C]

Answer/Explanation

Answer: a
Explaination: (a) is true of Cucurbits.

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77. Which of the following statements is true of date palm? [AI 2013C]
(a) It is monoecious producing both staminate flowers and pistillate flowers in the same plant.
(b) It is monoecious producing staminate flowers in one tree and pistillate flowers in another tree.
(c) It is dioecious producing staminate flowers in one tree and pistillate flowers in another tree.

Answer/Explanation

Answer: c
Explaination: (c) is true of date palms.

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78. Cucurbits and papaya plants bear staminate and pistillate flowers. Mention the categories they are put under separately on the basis of the type of flowers they bear. [Delhi 2012; HOTS]
Or
How are Cucurbita plants different from papaya plants with reference to the flowers they bear? [AI 2011C; HOTS]

Answer/Explanation

Answer:
Explaination: – Cucurbits are monoecious, as staminate and pistillate flowers are found in the same individual plant.
– Papaya plants are dioecious as an individual plant bears exclusively either staminate flowers or pistillate flowers.

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79. All papaya plants bear flowers, but fruits are seen only in some. Explain. [AI 2011C; HOTS]
Or
All date palm plants bear flowers, but fruits are seen in some. Explain. [AI 2011C]

Answer/Explanation

Answer:
Explaination: Papaya/date palm is dioecious; the plants which produce only male flowers, do not bear fruits, while the plants which produce female flowers, bear fruits.

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80. Label the male and female sex organs writh their technical terms in the figure of Chara, given below.

Answer/Explanation

Answer:
Explaination:

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81. Meiosis is an essential event in the sexual cycle of any organism. Give two reasons.? [Foreign 2015; HOTS]

Answer/Explanation

Answer:
Explaination: (i) It creates genetic variation in the offspring and help in survival of species.
(ii) It is necessary to maintain the characteristic chromosome number through generations.

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82. Name the group of organisms that produces non-motile male gametes. How do they reach the female gamete for fertilisation? [Foreign 2011]

Answer/Explanation

Answer:
Explaination: – Seed plants (gymnosperms and angiosperms) produce non-motile male gametes.
– They are carried in the pollen tube to the female gametes.

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83. Name the phenomenon and one bird where the female gamete directly develops into a new organism. [AI 2013]

Answer/Explanation

Answer:
Explaination: Parthenogenesis is the phenomenon. Turkey shows it.

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84. Name the common phenomenon with reference to reproduction in rotifers, honey bees and turkey. [Delhi 2013C]

Answer/Explanation

Answer:
Explaination: They all show parthenogenesis.

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85. Name the phenomenon and the cell, responsible for the development of a new individual without fertilisation as seen in honeybees. [Foreign 2011]

Answer/Explanation

Answer:
Explaination: – Parthenogenesis is the phenomenon.
– Female gamete (ovum) is the cell.

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86. In the whiptail lizards, only females are bom generation after generation. There are no males. How is this possible? [CBSE Sample Paper 2010; HOTS]
Or
The turkey usually produces females for several generations. How is this possible? [CBSE Sample Paper 2010; HOTS]

Answer/Explanation

Answer:
Explaination: The whiptail lizard/turkey shows parthe-nogenesis, the phenomenon in which the female gamete undergoes development without fertilisation into a new individual; in these animals it develops into a female individual.

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87. Mention the site where syngamy occurs in amphibians and reptiles, respectively. [AI 2010]

Answer/Explanation

Answer:
Explaination: – In amphibians, it occurs in the medium of water, i.e. external fertilisation.
– In reptiles, it occurs inside the body of female animals, i.e. internal fertilisation.

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88. In which two of the following organisms is fertilisation external?
Bony fishes, Ferns, Frogs, Birds [Delhi 2014C]

Answer/Explanation

Answer:
Explaination: Bony fishes and frogs.

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89. Name the type of cell division that takes place in the zygote of an organism exhibiting haplontic life cycle. [Delhi 2011]

Answer/Explanation

Answer:
Explaination: Meiosis.

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90. At what stage does meiosis occur in an organism exhibiting haploidic life cycle and mention the fate of the products thus produced. [Delhi 2019]

Answer/Explanation

Answer:
Explaination: – Meiosis occurs during the germination of zygote.
– The haploid spores formed develop into haploid individuals.

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We hope the given Biology MCQs for Class 12 with Answers Chapter 1 Reproduction in Organisms will help you. If you have any query regarding CBSE Class 12 Biology Reproduction in Organisms MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf with Answers to know their preparation level.

Sexual Reproduction in Flowering Plants Class 12 Biology MCQs Pdf

1. How many microspore mother cells are required to produce 1000 microspores/pollen grains?
(a) 100
(b) 150
(c) 200
(d) 250

Answer

Answer: d

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2. Which of the following represents the female gametophyte in angiosperms?
(a) Embryo
(b) Embryo sac
(c) Synergid
(d) Endosperm

Answer

Answer: b

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3. In a breeding experiment, the selected male parent is diploid and the female parent is tetraploid. What will be the ploidy level of the endosperm that will develop after double fertilisation?
(a) Diploid
(b) Triploid
(c) Tetraploid
(d) Pentaploid

Answer

Answer: d

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4. The development of fruits without fertilisation of the ovary, is called
(a) parthenogenesis
(b) parthenocarpy
(c) agamospermy
(d) apomixis

Answer

Answer: b

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5. When the pollen of a flower is transferred to the stigma of another flower on the same plant, the process is known as
(a) autogamy
(b) geitonogamy
(c) xenogamy
(d) cleistogamy

Answer

Answer: b

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6. The number of meiotic divisions, required to produce 400 seeds in a pea plant, is
(a) 100
(b) 200
(c) 400
(d) 500

Answer

Answer: d

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7. A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is [NCERT Exemplar]
(a) plant is dioecious and bears only pistillate flowers.
(b) plant is dioecious and bears both pistillate and staminate flowers.
(c) plant is monoecious.
(d) plant is dioecious and bears only staminate flowers.

Answer

Answer: d

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8. Autogamy can occur in a chasmogamous flower if [NCERT Exemplar]
(a) pollen matures before maturity of ovule.
(b) ovules mature before maturity of pollen.
(c) both pollen and ovules mature simultaneously.
(d) both anther and stigma are of equal lengths.

Answer

Answer: c

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9. Choose the correct statement from the following. [NCERT Exemplar]
(a) Cleistogamous flowers always exhibit autogamy.
(b) Chasmogamous flowers always exhibit geitonogamy.
(c) Cleistogamous flowers exhibit both autogamy and geitonogamy.
(d) Chasmogamous flowers never exhibit autogamy.

Answer

Answer: a

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10. From among the situations given below, choose the one that prevents both autogamy and geitonogamy. [NCERT Exemplar]
(a) Monoecious plant bearing unisexual flowers.
(b) Dioecious plant bearing only male or female flowers.
(c) Monoecious plant with bisexual flowers.
(d) Dioecious plant with bisexual flowers.

Answer

Answer: b

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11. In a fertilised embryo sac, the haploid, diploid and triploid structures are: [NCERT Exemplar]
(a) Synergid, zygote and primary endosperm nucleus.
(b) Synergid, antipodal and polar nuclei.
(c) Antipodal, synergid and primary endosperm nucleus.
(d) Synergid, polar nuclei and zygote.

Answer

Answer: a

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12. In an embryo sac, the cells that degenerate after fertilisation are: [NCERT Exemplar]
(a) Synergids and primary endosperm cell.
(b) Synergids and antipodals.
(c) Antipodals and primary endosperm cell.
(d) Egg and antipodals.

Answer

Answer: b

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13. Which of the following floral parts forms the pericarp after fertilisation?
(a) Nucellus
(b) Outer integument
(c) Ovary wall
(d) Inner integument

Answer

Answer: c

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14. The stalk of the ovule is called _____ .

Answer/Explanation

Answer:
Explaination: Funicle.

---

15. The outer integument of the ovule develops into _____ after fertilisation.

Answer/Explanation

Answer:
Explaination: Testa.

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16. The exine of pollen grains is made up of ______ .

Answer/Explanation

Answer:
Explaination: Sporopollenin.

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17. The outermost layer of endosperm in a maize grain is known as ______ .

Answer/Explanation

Answer:
Explaination: Aleurone layer.

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18. A bisexual flower that never opens, is called ______ .

Answer/Explanation

Answer:
Explaination: Cleistogamous.

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19. In the grass family, the single cotyledon is called ______ .

Answer/Explanation

Answer:
Explaination: Scutellum.

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20. The hollow foliar structure that encloses the leaf primordia in a grass embryo, is called ______ .

Answer/Explanation

Answer:
Explaination: Coleoptile

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21. In apple, the ______ also contributes to fruit formation and becomes edible.

Answer/Explanation

Answer:
Explaination: Thalamu

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22. Occurrence of more than one embryo in a seed, is known as ______ .

Answer/Explanation

Answer:
Explaination: Polyemb

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23. Dehydration and _____ of mature seeds are crucial for storage of seeds.

Answer/Explanation

Answer:
Explaination: Dormancy.

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24. Match the terms in Column I with the descriptions in Column II.

Column I	Column II
A. Pericarp	1. Cotyledon in the seeds of grasses.
B. Pollen grains of  Vallisneria	2. Remains of nucellus in a seed.
C. Perisperm	3. Mucilaginous covering.
D. Scutellum	4. Wall of the true fruit.

Answer/Explanation

Answer:
Explaination: A – 4, B – 3, C – 2, D – 1

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25. Match the terms in Column I with the descriptions in Column II.

Column I	Column II
A. Syncarpous ovary	1. Occurrence of more than one embryo in a seed.
B. Polyembryony	2. Carpels in a flower are fused together.
C. Apomixis	3. Removal of Stamens from the bisexual flower bud.
D. Emasculation	4. Formation of seeds without fertilisation.
	5. Development of ovary into fruit without fertilisation.

Answer/Explanation

Answer:
Explaination: A – 2, B – 1, C – 4, D – 3

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26. Sepals and petals orperianth are inconspicuous in entomophilous flowers. [True/False]

Answer/Explanation

Answer:
Explaination: False.

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27. In Zostera, the pollen grains are long and ribbon-like and released inside the water. [True/False]

Answer/Explanation

Answer:
Explaination: True.

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28. Embryo sac → Nucellus → Integuments, is the correct sequence of parts in the ovule of an angiosperms. [True/False]

Answer/Explanation

Answer:
Explaination: True.

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29. Conidia are formed endogenously while zoospores are formed endogenously. [True/False]

Answer/Explanation

Answer:
Explaination: False.

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30. Meiosis does not occur in the organisms showing haplontic life cycle. [True/False]

Answer/Explanation

Answer:
Explaination: False.

---

Directions (Q31 to Q35): Mark the odd one in each of the following groups.

31. Antipodal cells, Synergids, Zygote, Female gamete

Answer/Explanation

Answer:
Explaination: Zygote.

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32. Zygote, Endosperm, Embryo, Persperm

Answer/Explanation

Answer:
Explaination: Endosperm.

---

33. Radicle, Plumule, Endosperm, Scutellum

Answer/Explanation

Answer:
Explaination: Endosperm.

---

34. Mango, Apple, Strawberry, Cashew

Answer/Explanation

Answer:
Explaination: Mango.

---

35. Epidermis, Endothecium, Middle layers, Sporogenous tissue.

Answer/Explanation

Answer:
Explaination: Sporogenous tissue.

---

36. How many microsporangia are present in a typical anther of an ar.giosperm? [Foreign 2013]

Answer/Explanation

Answer:
Explaination: Four microsporangia.

---

37. Name the innermost and outermost wall layers of a microsporangium in an angiosperm anther. [Foreign 2013]

Answer/Explanation

Answer:
Explaination: Tapetum is the innermost.
Epidermis is the outermost.

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38. An anther with malfunctioning tapetum often fails to produce viable male gametophyte. Give any one reason. [Delhi 2013,10; HOTS]

Answer/Explanation

Answer:
Explaination: Since the tapetum nourishes the developing pollen grains, their development is impaired.

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39. How many microspore mother cells would be required to produce one hundred pollen grains in a pollen sac? And why? [Foreign 2013]

Answer/Explanation

Answer:
Explaination: Twenty five microspore mother cells. Each microspore mother cell undergoes meiosis and forms four microspores.

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40. AbilobeddithecousantherhaslOOmicrospore mother cells per microsporangium. How many male gametophytes can this anther produce? [Delhi 2010; HOTS]

Answer/Explanation

Answer:
Explaination: 1600 male gametophytes.

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41. What are germ pores?

Answer/Explanation

Answer:
Explaination: Germ pores are those places on the exine of a pollen grain, where sporopollenin is thin or absent and gives the appearance of an aperture.

---

42. Give an example of a plant which came into India as a contaminant and is a cause of pollen allergy. [AI 2014]

Answer/Explanation

Answer:
Explaination: Parthenium (Carrot grass).

---

43. Mention two environmental factors that affect pollen viability. [Delhi 2011C]

Answer/Explanation

Answer:
Explaination: Temperature and humidity.

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44. How are different varieties of pollen grains stored for long period of time in pollen banks? [AI 2017C]
or
Mention any one application of a pollen bank [Delhi 2011C]

Answer/Explanation

Answer:
Explaination: The pollen grains can be stored for years in liquid nitrogen (-196 °C) in pollen banks and used for crop breeding programmes.

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45.

These pictures show the gynoecium of (A) Papaver and (B) Michelia flowers.
Write the difference in the structure of their ovaries. [Delhi 2015C]

Answer/Explanation

Answer:
Explaination: – In (A) Papaver, the ovary is syncarpous, where the carpels are fused together.
– In (B) Michelia, the ovary is apocarpous, where the carpels remain free from one another.

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46. What represents the (a) basal part and (b) female gametophyte of the ovule?

Answer/Explanation

Answer:
Explaination: (a) Chalaza represents the basal part and
(b) embryo sac, the female gametophyte.

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47. How many megaspore mother cell(s) become(s) differentiated in an ovule?

Answer/Explanation

Answer:
Explaination: Only one megaspore mother cell becomes differentiated in an ovule.

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48. When does cell wall formation start, in the organisation of the embryo sac?

Answer/Explanation

Answer:
Explaination: At the eight-nucleate stage.

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49. Of the eight nuclei formed in the em bryo sac, six become organised into cells.
(a) What term is given to the other two nuclei?
(b) Name the cell in which they are present.

Answer/Explanation

Answer:
Explaination: (a) The other two nuclei are called polar nuclei.
(b) They are present in the central cell.

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50. What is filiform apparatus?

Answer/Explanation

Answer:
Explaination: Filiform apparatus refers to the special cellular thickenings in the synergids, towards micropylar tip.

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51. State the function of filiform apparatus found in mature embryo sac of an angiosperm. [Foreign 2014]

Answer/Explanation

Answer:
Explaination: They play an important role in guiding the pollen tube to enter one of the synergids.

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52. Describe the structure of the cell (s) that guide (s) the pollen tube to enter the embryo sac. [AI 2014C]

Answer/Explanation

Answer:
Explaination: The synergids have filiform apparatus, the special cellular thickenings at the micropylar tip.

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53. State the significance of pollination.

Answer/Explanation

Answer:
Explaination: Pollination brings the carrier of male gametes, i.e. pollen to the stigma of the pistil.

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54. Why are cleistogamous flowers invariably autogamous?

Answer/Explanation

Answer:
Explaination: Cleistogamous flowers are the bisexual flowers which do not open at all even at maturity and their stamens and stigma are never exposed for xenogamy or geitonogamy; the anthers and stigma lie close to each other and self pollination is effected easily.

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55. How is it possible in Oxalis and Viola plants to produce assured seed-sets even in the absence of pollinators? [Foreign 2012: HOTS]
Or
Pea flowers produce assured seed-sets. Give a reason. [AI 2010; HOTS]

Answer/Explanation

Answer:
Explaination: Oxalis and Viola or pea produce cleistogamous flowers, in which anthers and stigma lie close to each other; when the anthers dehisce in the flower buds, the pollen grains fall on the stigma and fertilization is effected leading to assured seed-set.

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56. Give the technical term for the type of pollination
(a) which ensures genetic recombination.
(b) between different flowers of the same plant

Answer/Explanation

Answer:
Explaination: (a) Xenogamy.
(b) Geitonogamy.

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57. The following statements describe the wind-pollinated plants. Which one of these statements is incorrect? [CBSE Sample Paper 2013]
(a) The pollen grains are sticky.
(b) Stamens are well-exposed.
(c) Flowers often have single ovule.

Answer/Explanation

Answer:
Explaination: (a) The pollen grains are sticky.

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58. Mention the pollinating agent of an inflorescence of small dull-coloured flowers with well-exposed stamens and large feathery stigmas. Give any one characteristic of pollen grains produced by such flowers.

Answer/Explanation

Answer:
Explaination: – Wind is the pollinating agent.
– The pollen grains are light and non- sticky/dry.

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59. Name the part of the flower, which the tassels of the com cob represent. [A t 2014]

Answer/Explanation

Answer:
Explaination: Styles and stigmas.

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60. Why do com cobs have long tassels? [AI 2010C; HOTS]

Answer/Explanation

Answer:
Explaination: The long tassels of com cob are the styles and stigmas; they are meant to easily trap the air-bome pollen grains.

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61. Name two groups of plants where water is the medium for transport of male gametes. [AI 2010C; HOTS]

Answer/Explanation

Answer:
Explaination: Bryophytes and pteridophytes.

---

62. How do the pollen grains of Vallisneria protect themselves? [AI 2012]

Answer/Explanation

Answer:
Explaination: Pollen grains of Vallisneria are protected from wetting by the mucilaginous covering.

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63. The following statements (i), (ii) and (iii) . seem to describe the water-pollinated submerged plants. Which one of these statements is incorrect?
(i) The flowers do not produce nectar.
(ii) The pollen grains have mucilaginous covering.
(iii) The brightly-coloured female flowers have long stalks to reach the surface.

Answer/Explanation

Answer:
Explaination: (iii) is incorrect.

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64. How do flowers of Vallisneria get pollinated? [Foreign 2013]

Answer/Explanation

Answer:
Explaination: Vallisneria shows true hydrophily, i.e. pollination by water.

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65. Why do the pollen grains of Vallisneria have a mucilaginous covering?[Delhi 2010C; HOTS]

Answer/Explanation

Answer:
Explaination: The mucilaginous covering protects the pollen grains from wetting and the consequent decay.

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66. Mention the pollinating agents for aquatic plants, Vallisneria and water lily, respectively. [AI 2010C]

Answer/Explanation

Answer:
Explaination: Vallisneria is pollinated by water and water lily is pollinated by insects.

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67. What are nectar/pollen robbers?

Answer/Explanation

Answer:
Explaination: Nectar/pollen robbers are those floral visitors which consume pollen or nectar without bringing about pollination.

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68. What is meant by ‘self-pollen’?

Answer/Explanation

Answer:
Explaination: ‘Self-pollen’ means the pollen grains from the same flower (as of the stigma) or pollen from other flowers of the same plant.

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69. How is fertilisation by a self-incompatible pollen prevented?

Answer/Explanation

Answer:
Explaination: Fertilisation by a self-incompatible pollen is prevented by:
(a) inhibiting the germination of the pollen.
(b) retarding the growth of the pollen tube.

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70. What is pollen-pistil interaction and how is it mediated? [Foreign 2014]

Answer/Explanation

Answer:
Explaination: – All those events from the deposition of pollen on the stigma till the entry of pollen tube into the ovule, are collectively referred to as pollen-pistil interaction.
– It is mediated by the interaction of chemicals secreted by the pollen and the stigma.

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71. The meiocyte of rice has 24 chromosomes.
Write the number of chromosomes in its endosperm. [Delhi 2013C; HOTS]

Answer/Explanation

Answer:
Explaination: 36 chromosomes.

---

72. What happens to the endospenn in seeds like castor?

Answer/Explanation

Answer:
Explaination: It is used by the embryo for nutrition during seed germination.

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73. Fill in the blanks a and b
Zygote → a → Globular embryo → b → Mature embryo.

Answer/Explanation

Answer:
Explaination: (a) Proembryo
(b) Heart-shaped embryo

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74. Identify ‘A’ in the figure showing a stage of embryonic development in a dicot plant and mention its function. [AI 2016C]

Answer/Explanation

Answer:
Explaination: ‘A’ represents the cotyledons.
– Cotyledons have reserve food materials that are used by the embryo during germination of the seed.

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75. Mention the common function that cotyledons and nucellus perform.
Or
Mention the common function that endosperm and perisperm perform.

Answer/Explanation

Answer:
Explaination: They help in the nourishment of the embryo, with the reserve food materials stored in them.

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76. Name the part of the flower that contributes to fruit fonnation in strawberry and guava respectively.

Answer/Explanation

Answer:
Explaination: Thalamus in strawberry and ovary in guava.

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77. Why is banana referred to as a parthenocarpic fruit? [AI 2013C]
Or
Why is banana considered a good example of parthenocarpy? [AI 2012; HOTS]

Answer/Explanation

Answer:
Explaination: Banana fruit develops without fertilisation of the ovary; hence it is considered parthenocarpic.

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78. Banana produces fruits, but is propagated only by vegetative means. Why is it so? [Foreign 2012: HOTS]

Answer/Explanation

Answer:
Explaination: – Banana produces fruit without fertilization of ovary; the process is known as parthenocarpy.
– Since, parthenocarpic fruits are seedless or the seeds are non-viable, banana is propagated by vegetative means.

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79. Given below is a section of a maize grain. Identify ‘A’ and state its function.[AI 2016C]

Answer/Explanation

Answer:
Explaination: ‘A’ represents the endosperm.
– It stores food materials, which are used by the embryo during seed germination.

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80. Mention two advantages of seeds to man,

Answer/Explanation

Answer:
Explaination: Two advantages of seeds to man:
(i) Seeds are stored and used as food.
(ii) They are used to raise the crop.

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81. How does a farmer use the dormancy of seeds to his advantage?

Answer/Explanation

Answer:
Explaination: Dormancy and dehydration are crucial for storage of seeds; the farmer dehydrates the dormant seeds and stores the seeds for raising a new crop in the next season.

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82. Name the seeds that have retained their viability for thousands of years.

Answer/Explanation

Answer:
Explaination: Lupinus arcticus and Phoenix dactylifera.

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83. Name two parasitic species of plants that produce many minute seeds in a fruit.

Answer/Explanation

Answer:
Explaination: Orobanche and Striga.

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84. Name the mechanism responsible for the formation of seed without fertilisation in angiosperms. Give an example of a species of flowering plants with such seed formation. [Delhi 2010C]

Answer/Explanation

Answer:
Explaination: Apomixis is the phenomenon e.g. grasses, Citrus, mango and members of Asteraceae. (any one)

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85. Normally one embryo develops in one seed, but when an orange seed is squeezed, many embryos of different shapes and sizes are seen. Mention how it has happened. [Delhi 2011]

Answer/Explanation

Answer:
Explaination: – Orange shows polyembryony, the phenomenon of occurrence of more than one embryo in a seed.
– In this case, some of the nucellar cells surrounding the embryo sac start dividing, protrude into embryo sac and develop into embryos.

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We hope the given Biology MCQs for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants will help you. If you have any query regarding CBSE Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf, drop a comment below and we will get back to you at the earliest.