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Q.

How many meiotic and mitotic divisions are required to form 7–celled and 8 – nucleated embryo sac from megaspore mother cell?

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a

One meiotic and 2 mitotic divisions

b

One meiotic and 3 mitotic divisions

c

One meiotic and 4 mitotic divisions

d

Three mitotic divisions only

answer is A.

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Detailed Solution

Megaspore mother cell undergoes meiosis once to form four haploid megaspores out of which three get degenerated and only one is functional. This functional megaspore undergoes three sequential mitotic divisions to form 7 cellled and 8 nucleated embryo sac.

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