Question

During the formation of embryo sac, the functional megaspore undergoes _____________.

• A. Two mitotic divisions
• B. Two meiotic divisions
• C. Three meiotic divisions
• D. Three mitotic divisions

Answer 1

The correct option is D Three mitotic divisions

The megaspore mother cell undergoes meiosis to give 4 haploid cells. The three haploid cells degenerate and one become the embryo sac. The embryo sac grows in size and the haploid nucleus undergoes mitosis to form two haploid nuclei which later undergo mitosis to form 4 haploid nuclei in the embryo sac. In the final mitosis, 8 haploid cells are produced. So, the functional megaspore undergoes 3 mitotic divisions to form the mature embryo sac.

So, the correct option is D.