A process where the diploid cell of an ovule outside the embryo sac developing into another embryo sac without reduction is known as apospory. When diploid cells of nucellus divide to form diploid embryo sac which contains diploid egg cell, from which embryo develops without fertilization or gametic fusion, then it is called apospory. This mechanism of seed formation without gametic fusion or fertilization is called apomixes. It is commonly present in members of Asteraceae and grasses.