How do the pollen grains of Vallisneria protect themselves?

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Solution

Pollination in Vallisneria :
In Vallisneria, water is the pollinating agent.
So, the pollen grains are wrapped by mucilaginous coating to protect them from getting wet by water.
The pollen grains from the male flowers are dispersed into the surface of the water.
The flowers of female Vallisneria come on the water surface through the long stalk to collect the pollens.

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Q. One mark Questions:
How do the pollen grains of Vallisneria protect themselves?

Q. How do porifera protect themselves?

Q. (i) How do bacteria protect themselves ?

Q. [A]: Pollen grains are stored in liquid nitrogen.
[R]: Cryopreservation protects the viability of pollen.

Which of the following statements are correct for hydrophily?

(i) Pollination by water is rare in flowering plants and is limited mostly to monocotyledons.

(ii) In majority of aquatic plants such as water hyacinth and water lily pollination takes place by insects and wind

(iii) In most of the water pollinated species pollen grains are protected from wetting by a mucilaginous covering.

(iv) In Vallisneria, female flowers reach the surface of water and receive the pollen grains, whereas in Zostera, female flowers remain submerged and receive pollen grains under water.

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