In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the integument, forming its outer layer, the nucellus (or remnant of the megasporangium), and the female gametophyte (formed from a haploid megaspore) in its center. The female gametophyte — specifically termed a megagametophyte— is also called the embryo sac in angiosperms. The megagametophyte produces an egg cell for the purpose of fertilization.
The structure in a plant that develops into a seed after fertilization; the megasporangium of a seed plant with its enclosing integuments.
An immature ovum in mammals.
The female gamete in animals; the egg cell.
The rudiment of a seed. It grows from a placenta, and consists of a soft nucleus within two delicate coatings. The attached base of the ovule is the hilum, the coatings are united with the nucleus at the chalaza, and their minute orifice is the foramen.
a small body that contains the female germ cell of a plant; develops into a seed after fertilization
a small or immature ovum
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