Ovule
Ovule literally means "small
egg." In
seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: The integuments forming its outer layer, the nucellus (or
megasporangium), and the megaspore-derived female gametophyte (or megagametophyte) in its center. The megagametophyte (also called embryo sac in flowering plants) produces the
egg cell for
fertilization. After fertilization, the ovule develops into a
seed.
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Ovule (botanique)
Nucellus
Zalazek
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nucellus
خورش ،هسته تخم چه