CHAPTER 1: SEXUAL REPRODUCTION IN FLOWERING PLANTS
EXERCISES
1. Name the parts of an angiosperm flower in which development of male
and female gametophyte take place.
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2. Differentiate between microsporogenesis and megasporogenesis. Which
type of cell division occurs during these events? Name the structures
formed at the end of these two events.
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3. Arrange the following terms in the correct developmental sequence:
Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell,
male gametes.
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4. With a neat, labelled diagram, describe the parts of a typical angiosperm
ovule.
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5. What is meant by monosporic development of female gametophyte?
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6. With a neat diagram explain the 7-celled, 8-nucleate nature of the female
gametophy.
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7. What are chasmogamous flowers? Can cross-pollination occur in
cleistogamous flowers? Give reasons for your answer.
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8. Mention two strategies evolved to prevent self-pollination in flowers.
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9. What is self-incompatibility? Why does self-pollination not lead to seed
formation in self-incompatible species?
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10. What is bagging technique? How is it useful in a plant breeding
programme?
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11. What is triple fusion? Where and how does it take place? Name the
nuclei involved in triple fusion.
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12. Why do you think the zygote is dormant for sometime in a fertilised
ovule?
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13. Differentiate between:
(a) hypocotyl and epicotyl;
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(b) coleoptile and coleorrhiza;
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(c) integument and testa;
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(d) perisperm and pericarp
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14. Why is apple called a false fruit? Which part(s) of the flower forms the
fruit?
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15. What is meant by emasculation? When and why does a plant breeder
employ this technique?
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16. If one can induce parthenocarpy through the application of growth
substances, which fruits would you select to induce parthenocarpy
and why?
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17. Explain the role of tapetum in the formation of pollen-grain wall.
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18. What is apomixis and what is its importance?
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