NEET BIOLOGY

Detailed explanation-1: -Vallisneria is an aquatic plant. In case of vallisneria water is the agent for cross pollination. In female vallisneria the flower reaches to the surface of water by the long stalk and the male flower or pollen grains are released into the surface of water. Female flowers or stigma carried them by water current .

Detailed explanation-2: -Vallisneria is an aquatic plant. The female flowers appear on the surface of water due to the presence of long stalks. With the help of water currents, the pollen grains from male flowers float on the water surface to reach to female flowers. Thus, pollination takes place by water (hydrophily).

Detailed explanation-3: -The long stalks of the female flower begin to coil down to the bud level where the fruit ripens.

Detailed explanation-4: -Pollination in Vallisneria is epihydriphilous. It is a type of hydrophily which occurs on the surface of water. The female flower have a very long pedicel, therefore it reaches the surface of water. Male flowers after breakage floats on the surface of water.

Detailed explanation-5: -Solution : Mode of pollination in (i) Vallisneria epihydrophily (ii) water lily-entomophily.