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How does endosperm of angiosperms become...

How does endosperm of angiosperms become triploid ?

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Endorperm in Angiosperm is formed as a result of triple fusion or vegetative fertilisation. It invovles fusion of male gamete with 2 haploid polar nuclei, forming triploid PEN present in Primary Enderperm Cell (PEC). This later with repeated division form multicellular, triploid nutritive tissue called endosperm.
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Double fertilization leading to initiation of endosperm in angiosperms, requires

BETTER CHOICE PUBLICATION-SEXUAL REPRODUCTION IN FLOWERING PLANTS -SHORT ANSWER TYPE QUESTIONS
  1. Why is the fertilization in angiosperms called double fertilization ?

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  2. Give advantages of cross-pollination.

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  3. How does endosperm of angiosperms become triploid ?

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  4. What is the significance of double fertilization ?

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  5. What is triple fusion ? Where and how does it take place ? Name nuclei...

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  6. What is entomophily ? Write its example.

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

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  8. What is ornithophily ? Write two characteristics.

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  9. What is the fate of secondary nucleus and integument after fertilizati...

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  10. Write any two differences between apocarpous and syncarpous ovary.

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  11. Draw a labelled diagram of the longitudinal section of a maize grain t...

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  12. Draw a labelled diagram of the longitudinal section of an anatropous o...

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  13. Draw a labelled diagam of the longitudinal section of pistal showing p...

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  14. Write down six characters of wind pollinated flowers.

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  15. What is double fertilization?

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  16. Describe the structure of Pollen grain and process of its germination.

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  17. Draw a well labelled diagram of L.S. of orthotropus ovule.

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  18. Define Porogamy.

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  19. Define Zoophily.

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  20. Define mesogamy.

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