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.
1. The terms homothallic and monoecious are used to denote
(a) unisexual condition
(b) bisexual condition
(c) staminate flowers
(d) pistillate flowers.
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: a
3. In animals, juvenile phase is followed by,
(a) reproductive phase
(b) senescent phase
(c) old age
(d) vegetative phase.
Answer: a
4. External fertilisation occurs in majority of
(a) fungi
(b) liverworts
(c) algae
(d) mosses
Answer: c
5. Vegetative propagation in Pistia occurs by
(a) sucker
(b) offset
(c) runner
(d) rhizome
Answer: b
6. Sugarcane is propagated by
(a) stem cutting
(b) leaf buds
(c) root cutting
(d) seeds
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: 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: 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: 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: 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: 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: d
13. Development of unfertilised ovum into a new individual is called ____ .
Answer:
Explaination: Parthenogenesis.
14. Earthworms and sponges are _____ animals.
Answer:
Explaination: Bisexual/Hermaphrodite.
15. Gametogenesis and gamete transfer are _____ events.
Answer:
Explaination: Pre-fertilisation.
16. ____ cycle occurs in non-primate mammals like cows and dogs.
Answer:
Explaination: Oestrous.
17. _____ are the motile microscopic structures produced by many algal species.
Answer:
Explaination: Zoospores.
18. Vegetative reproduction in plants is a method of _____ reproduction.
Answer:
Explaination: Asexual.
19. ____ results in the formation of zygote.
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:
Explaination: Calcareous.
21. _____ is the vital link that ensures continuity between one generation to the next.
Answer:
Explaination: Zygote.
22. The offspring of ____ animals are vulnerable to predators.
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:
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:
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:
Explaination: False.
26. Mitotic cell divisions occur during embryo-genesis. [True/False]
Answer:
Explaination: True.
27. Plants produced through vegetative propagation are called clones. [True/False]
Answer:
Explaination: True.
28. Bony fishes, bryophytes and pteridophytes show internal fertilisation. [True/False]
Answer:
Explaination: False.
29. Gametes are always haploid and gametogenesis always involves meiosis. [True/False]
Answer:
Explaination: False.
Directions (Q30 to Q34): Mark the odd one in each of the following groups.
30. Earthworms, Sponges, Cockroaches, Tapeworms.
Answer:
Explaination: Cockroaches.
31. FUCHS, Cladophora, Funaria, Homo sapiens
Answer:
Explaination: Cladophora.
32. Turkey, Honey bees, Camels, Rotifers
Answer:
Explaination: Camels.
33. Bony fishes, Reptiles, Birds, Bryophytes
Answer:
Explaination: Bony fishes.
34. Reptiles, Monkeys, Birds, Frogs
Answer:
Explaination: Frogs.
35. Name the biological process that enables continuity of species. [Delhi 2012C]
Answer:
Explaination: Reproduction.
36. Define reproduction.
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:
Explaination: Asexual reproduction.
38. Offspring derived by asexual reproduction are called clones. Justify giving two reasons. [AI 2010; HOTS]
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:
Explaination: Amoeba, Paramoecium (any one)
40. Name the type of asexual reproduction, where the parent cell ceases to exist. [Delhi 2017C]
Answer:
Explaination: Binary fission.
41. Which ones of the following organisms exhibit binary fission?
Bacillus, Penicillium, Yeast, Amoeba. [AI 2012C]
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:
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: 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:
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:
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:
Explaination:
47. Under unfavourable conditions, Amoeba shows encystation. What does it mean?
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:
Explaination: (a) Yeast
(b) Penicillium
49. Name an alga that reproduces asexually through zoospores. Why are these reproductive units so called? [AI 2013]
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:
Explaination: – Zoospores
– Chlamydomonas
51. Mention a characteristic feature and a function of zoospores in some algae. [AI 2010]
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:
Explaination: Penicillium reproduces asexually by forming conidia.
53. Name the respective asexual reproductive structures of Yeast and Sponge. [AI 2012C]
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: c
Explaination: (c) is true of Hydra
55. How is the phenomenon regeneration useful to a lizard?
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:
Explaination: (a) Bulbils
(b) Leaf buds.
57. Give one example each of a plant that reproduces by
(a) runner
(b) offset
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:
Explaination: Water hyacinth.
59. Identify the picture and mention the vegetative part that helps it to propagate. [AI 2015C]
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:
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: 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:
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:
Explaination: (i) ‘Eyes’ (buds) in the tuber
(ii) Offset.
64. Name the units of vegetative propagation in grasses and water hyacinth. [AI 2012C]
Answer:
Explaination: Grasses – Runner
Water hyacinth – Offset
65. Identify ‘A’ in the diagram and mention its function. [Delhi 2016 C]
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: c
Explaination: (c) is true of Bryophyllum.
67. Identify ‘A’ in the diagram and mention its function. [Delhi 2016C]
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:
Explaination: Sexual reproduction.
69. Name the phase, all organisms have to pass through before they can reproduce sexually. [AI 2011]
Answer:
Explaination: Juvenile phase (vegetative phase in plants)
70. What marks the end of juvenile phase in flowering plants?
Answer:
Explaination: Initiation of floral buds marks the end of juvenile phase in flowering plants.
71. Name the two groups of plants which show clear cut vegetative, reproductive and senescent phases.
Answer:
Explaination: Annual and biennial plants.
72. Mention the unique flowering phenomenon exhibited by Strobilanthus kunthiana (neelakurinji). [Delhi 2012]
Answer:
Explaination: This plant flowers once in twelve years.
73. Mention the unique feature with respect to flowering and fruiting in bamboo species. [Delhi 2012]
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.
74. Name two animals that exhibit oestrous cycle. [Foreign 2016]
Or
Give an example of an animal that exhibits oestrous cycle. [AI 2014C]
Answer:
Explaination: Cows/Sheep/Rats/Dogs/Deers/Tiger.
75. Write the two pre-fertilisation events from the list given below: Syngamy, Gametogenesis, Embryogenesis, Pollination. [Delhi 2014C]
Answer:
Explaination: Gametogenesis and pollination.
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: a
Explaination: (a) is true of Cucurbits.
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: c
Explaination: (c) is true of date palms.
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:
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.
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:
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.
80. Label the male and female sex organs writh their technical terms in the figure of Chara, given below.
Answer:
Explaination:
81. Meiosis is an essential event in the sexual cycle of any organism. Give two reasons.? [Foreign 2015; HOTS]
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.
82. Name the group of organisms that produces non-motile male gametes. How do they reach the female gamete for fertilisation? [Foreign 2011]
Answer:
Explaination: – Seed plants (gymnosperms and angiosperms) produce non-motile male gametes.
– They are carried in the pollen tube to the female gametes.
83. Name the phenomenon and one bird where the female gamete directly develops into a new organism. [AI 2013]
Answer:
Explaination: Parthenogenesis is the phenomenon. Turkey shows it.
84. Name the common phenomenon with reference to reproduction in rotifers, honey bees and turkey. [Delhi 2013C]
Answer:
Explaination: They all show parthenogenesis.
85. Name the phenomenon and the cell, responsible for the development of a new individual without fertilisation as seen in honeybees. [Foreign 2011]
Answer:
Explaination: – Parthenogenesis is the phenomenon.
– Female gamete (ovum) is the cell.
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:
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.
87. Mention the site where syngamy occurs in amphibians and reptiles, respectively. [AI 2010]
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.
88. In which two of the following organisms is fertilisation external?
Bony fishes, Ferns, Frogs, Birds [Delhi 2014C]
Answer:
Explaination: Bony fishes and frogs.
89. Name the type of cell division that takes place in the zygote of an organism exhibiting haplontic life cycle. [Delhi 2011]
Answer:
Explaination: Meiosis.
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:
Explaination: – Meiosis occurs during the germination of zygote.
– The haploid spores formed develop into haploid individuals.
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