Ovule
Cross section of an ovule of a pine tree. A=Gametophyte, B=Egg cell, C=Micropyle, D=Integument, E=Sporangium
Ovules produce the female reproductive cells which get fertilized during sexual reproduction in seed plants.[1] The word literally means "small egg."[2][3]
The megagametophyte (also called the embryo sac in flowering plants) is inside the ovule. The megagametophyte produces the egg cell.