How many meiotic and mitotic divisions would microspore mother cell undergo to form an embryo sac?
The megaspore mother cell or megasporocyte undergoes one meiotic division and forms four haploid cells. Three of them disintegrate and only one survive which is the megaspore. It then undergoes three mitotic division and forms the embryo sac. It is known as the female gametophyte which is multicellular. So for the formation of embryo sac one meiotic division and three mitotic division is required.