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a
In about 70% of angiosperms, pollination occur at 3-celled stage.
b
In about 40% of angiosperms, pollination occur at 2-celled stage.
c
Generative cell divides meiotically to form two male gametes.
d
In about 60% of the angiosperms, pollination occur when a pollen grain at least forms a vegetative cell and a generative cell.
answer is D.
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