During the formation of embryo sac, the functional megaspore undergoes:
A
Two mitotic divisions
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B
Two meiotic divisions
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C
Three meiotic divisions
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D
Three mitotic divisions
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Solution
The correct option is D Three mitotic divisions The megaspore mother cell undergoes meiosis to give rise to 4 haploid cells. Three haploid cells degenerate and one survives to become the embryo sac. The embryo sac enlarges in size and the haploid nucleus undergoes mitosis to form 2 haploid nuclei. The two haploid nuclei further undergo mitosis to form 4 haploid nuclei within the embryo sac. In the final round of mitosis 8 haploid nuclei are produced. Hence, the functional megaspore undergoes 3 mitotic divisions to form eight celled mature embryo sac.