Q.
For the formation of embryo sac, the megaspore mother cell undergoes
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a
two meiotic and two mitotic divisions
b
one meiotic and three mitotic divisions
c
two meiotic divisions
d
one meiotic and two mitotic divisions
answer is B.
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Detailed Solution
For the formation of embryo sac, the megaspore mother cell undergoes one meiotic and three mitotic divisions.The nucleus of the functional megaspore divides mitotically to form two nuclei which move to the opposite poles, forming the 2-nucleate embryo sac. Two more sequential mitotic nuclear divisions result in the formation of the 4-nucleate and later the 8-nucleate stages of the embryo sac.
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