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KEAMKEAM 2010Sexual Reproduction in Flowering Plants
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Solution:
The mode of pollination through the agency of water (hydrophily) is not very common and occur only in few aquatic plants, especially submerged ones, like Vallisneria, Ceratophyllum and Zostera. Zostera is submerged marine plant. It undergoes hypohydrophily i.e., pollination inside water. Its pollens are exceptionally long (up to 250 mm) and needle-like. The specific gravity
of these pollen is almost the same as that of sea water. Consequently, they can freely float in water at any depth. The stigma is also very long in this plant. If the pollen comes in contact with the stigma, it coils around the latter.