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At which cellular stage , does the polle...

At which cellular stage , does the pollen grains are usually liberated from the anther

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In general, the pollen grains are liberated at 2 - celled stage . On reaching the stigma at this stigma at this stage , the stigam at this stage , the generative cell divides meiotically and form two male gametes (male cells )
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FULL MARKS-ASEXUAL AND SEXUAL REPRODUCTION IN PLANTS-Additional Questions (2- Mark Questios)
  1. What are the chemical components that make up the wall layers of polle...

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  2. Draw and label the structure of a typical pollen grain.

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  3. At which cellular stage , does the pollen grains are usually liberated...

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  4. Write the equivalent botanical terms for the following words / sentenc...

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  5. What is Nucellus ?

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  6. What is integumentary tapetum ?

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  7. Mention the types of ovule seen in the members of (a) Cactaceae (b) ...

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  8. What does the term 'Bisporic development of embryo sac ' refers to ? G...

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  9. State the role of filiform apparatus found in embryo sac of angiosperm...

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  10. What is pollination ? Mention its types.

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  11. Why pollination in gymnosperm is said to be direct ?

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  12. Define Homogamy with an example

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  13. What is cross - pollination ? What are its types ?

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  14. Distinguish between monoecious and dioecious plants .

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  15. Define the following terms . (a) Protandry (b) Protogyny

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  16. What is Heterostyly ? Give example.

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  17. How self - pollination is avoided in Abutilon ?

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  18. Name the agents of the following tyes of pollination.

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  19. Give any four unique characters exhibited by anemophilous flowers.

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  20. How the pollen grains of Vallisneria protect themselves ?

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