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How does endosperm of angiosperms become...

How does endosperm of angiosperms become triploid?

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Endosperm of angiosperms develops from the central cell of embryosac where two polar nuclei fuse to form a secondary nucleus. The diploid nucleus of central cell fuses with one of the two male gametes. The two polar nuclei and one male gamete fuse to form a triploid primary endosperm nucleus. Thus the endosperm is formed from this triploid nucleus and becomes triploid.
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OSWAAL PUBLICATION-SEXUAL REPRODUCTION IN FLOWERING PLANTS -TOPIC-2 SHORT ANSWER TYPQ QUESTIONS-I
  1. Why do you think the zygote is dormant for sometime in a fertilized ov...

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  2. Differentiate between : (a) Hypocotyl and epicotyl (b) Coleoptile ...

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  3. Differentiate between : (a) Integument and testa (b) Perisperm and...

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  4. Why is apple called a false fruit? Which parts of the flower form the ...

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  5. What is polyembryony and how can it be commercially exploited?

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  6. Are parthenocarpy and apomixis different phenomena? Discuss their bene...

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  7. Which is the triploid tissue in a fertilised ovule? How is the triploi...

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  8. Is pollination and fertilisation necessary in apomixis? Give reasons.

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  9. What is a false fruit? Give an example.

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  10. What are the parthenocarpic fruits?

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  11. What is double fertilization?

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  12. What is Apomixis? What is its importance?

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  13. Write the significance of double fertilization.

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  14. Why is the process of fertilization in a flowering plant referred to a...

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  15. How does endosperm of angiosperms become triploid?

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  16. Banana is a parthenocarpic fruit whereas oranges show polyembryony. Ho...

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  17. Name the cell from which the endosperm of coconut develops. Give the c...

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  18. Why most of the zygotes in angiosperms divide only after certain amoun...

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