NEET BIOLOGY

Detailed explanation-1: -The megasporangium’s megaspore mother cell divides meiotically to produce four megaspores. In which, there is only one functional megaspore that develops into the embryo sac. The other three degenrates. This embryo sac is the female gametophyte.

Detailed explanation-2: -Final answer: In angiosperms, a functional megaspore develops into the embryo sac.

Detailed explanation-3: -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.

Detailed explanation-4: -An embryo sac is said to form when the haploid megaspore nucleus divides. It possesses two haploid nuclei and six haploid cells which do not have cell walls. In some cases, the haploid nuclei combine forming a single cell (endosperm motor cell).