Which type of pollination occurs in Vallisneria?

The correct answer is Option (3)- Hydrophily which occurs on the surface of water.

Vallisneria is an aquatic plant that grows in shallow water. The female flowers of Vallisneria have long stalks that reach the surface of the water. The male flowers are released from the plant and float on the surface of the water. The pollen grains from the male flowers are carried by water currents to the female flowers, where they are deposited on the stigma.

In this way, Vallisneria is pollinated by water currents. This type of pollination is called hydrophily.