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.
71. Name the two groups of plants which show clear cut vegetative, reproductive and senescent phases.
Answer/Explanation
Answer:
Explaination: Annual and biennial plants.
72. Mention the unique flowering phenomenon exhibited by Strobilanthus kunthiana (neelakurinji). [Delhi 2012]
Answer/Explanation
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/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.
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.
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.
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.
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.
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.
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.
80. Label the male and female sex organs writh their technical terms in the figure of Chara, given below.
Answer/Explanation
Answer:
Explaination:
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.
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.
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.
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.
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.
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.
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.
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.
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.
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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