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a
Hypohydrophily is common in Hydrilla
b
Vallisneria which is epihydrophilous plant is dioecious plant and flowers are unisexual.
c
In most of the water pollinated species, pollen grains are protected from wetting by a mucilaginous covering.
d
Pedicel (Stalk) of female flowers in Vallisneria are short and coiled.
answer is D.
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Detailed Solution
Pedicel (Stalk) of female flowers in Vallisneria are long and coiled. Therefore, the female flower reach the surface of water and epihydrophily takes place.