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Why do the pollen grains of Vallisneria ...

Why do the pollen grains of Vallisneria have a mucilaginous covering ?

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Pollen grains have a mucilage covering to protect themselves from wetting as Vallisneria is a water pollinated species .
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TRUEMEN BIOLOGY ENGLISH-REPRODUCTION-SECTION-D
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  7. Explain with the help of a diagram the development of a mature embryo ...

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  9. Explain the different stages of oogenesis in human starting from life ...

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  10. (a) When and how does placenta develop in human female? (b) How is ...

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  11. Give reasons why: (i) Most zygotes in angiosperms divide only afte...

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  12. Describe in sequence the events that lead to the development of a 3-ce...

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  14. (a ) Draw a labelled longitudinal view of an albuminous 'seed'· (b)...

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  15. Describe the post-zygotic events leading to implantation and placenta ...

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  19. Enumerate and describe any five reasons for introducing sex education ...

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  20. The following is the illustration of the sequence of ovarian events (a...

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  21. (a) Draw a schematic labelled diagram of a fertilised embryo sac of an...

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