Explain how some plants are adapted for achieving pollination through wind. How vallisneria and seagrasses achieve pollination?

Explanation

Hydrophily : Cross pollination by the agency of water is called hydrophily and such flowers are called hydrophilous flowers. Hydrophily can be seen in some submerged hydrophytes (aquatic plant) like hydrilla,elodea, vallisneria, etc. Characters of Hydrophilous flowers: *Generally,the pollen grains of submerged plants like hydrilla have same specific gravity as that of water,so that pollen grains suspend and float in water at different depths. * In vallisneria special types of characters are developed for cross pollination. It is dioecious.Male plant bears small sessile male flowers in submerged spadix. These flowers detach and float on the surface of the water, Female plant bears solitary female flowers on the spirally coiled stalks. When flowers mature the stalks uncoil and bring the flowers to the surface of the water. When male flowers come in contact with a female flower, the anthers burst open and sticky pollen grains deposit on the stigama.After the pollination,the stalk of the female flowers coils and thus flowers is brought down into water, where fruit formation takes place.