Functional megaspore in an angiosperm develops into the embryo sac. The embryo sac of angiosperm contains 7 cells and 8 nuclei. three cells are present at the chalazal end forms the antipodal cells. Three cells are present at the micropylar end forms the egg apparatus which contains one egg cell present in the middle of two synergid cells. One cell present in the center of the embryo sac called the central cell that contains two nuclei.