Question

Pollen grains in angiosperms ace not motile. They have to be carried to the stigma by external agents.

1. Name the process of transfer of pollen grains.

2. Write the name of three such agents.

3. Explain how it takes place in vallisnaria.

Answer 1

1. Transfer of pollen grains from the anther to the stigma is called pollination.

2. Wind water and animals

3. In vallisneria the female flowers reach the surface of water by long stalk and the male flowers or pollen grains are released to the surface of water and are carried by water currents to the female flower and fertilization takes place.