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a
Cryopreservation of pollen grain - at -196oC
b
Attractants and rewards required – Anemophily.
c
Prevent autogamy and geitonogamy - Dioecious flowering plants.
d
Vallisneria - Epihydrophily.
answer is B.
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Detailed Solution
Nectar and pollen grains are the usual floral rewards. Wind and water pollinated flowers are not very colourful and do not produce nectar. They need not offer any rewards to pollinators.