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Q.

Pollen grains are shed at 2-celled stage in :

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a

over 60% angiosperms

b

over 40% angiosperms

c

20% angiosperms

d

30% angiosperms.

answer is A.

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Detailed Solution

In over 60 per cent of angiosperms, pollen grains are shed at 2-celled stage (one large vegetative cell and a smaller generative cell) . In the remaining species, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage).

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Pollen grains are shed at 2-celled stage in :