Ovule
Female plant reproductive structure / From Wikipedia, the free encyclopedia
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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 ovule is a small structure present in the ovary. It is attached to the placenta by a stalk called a funicle. The funicle provides nourishment to the ovule. On the basis of the relative position of micropyle, body of the ovule , chalaza and funicle, there are six types of ovules. (a) Orthotropous ovule - the micropyle, chalaza and funicle all lie in the same straight line, this is the most primitive type of ovule. Eg: Piper, Polygonum and Cycas.