Ovule

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Location of ovules inside a Helleborus foetidus flower
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. The word literally means "small egg".[source?]

The megagametophyte (also called the embryo sac in flowering plants) is inside the ovule. The megagametophyte produces the egg cell.