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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
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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