| 1 | The chalazal end megaspore develops into the embryo sac mother cell. | |
| 2 | While in the Angiophyta the female gametophyte is simply the EMBRYO SAC . | |
| 3 | Starch grains present in the embryo sac and placenta are utilized by the embryo. | |
| 4 | Shortly after implantation the blastocyst wall, the trophoblast, consists of two layers of cells. | |
| 5 | Wall ingrowths occurred in central cell at micropylar region near embryo sac wall. |