Figure 306

A cross section of an immature ovule from a flower reveals a single large cell, a megaspore mother cell. This cell undergoes meiosis and produces four megaspores. One of the megaspores undergoes a series of mitotic divisions that results in the formation of an embryo sac (a female gametophyte).

Polar nuclei

Egg Eight nuclei (1n)

Embryo sac (female gametophyte)

Ovul Megasporangium

Micropyle

Egg Eight nuclei (1n)

Embryo sac (female gametophyte)

Pistil-

Stigma

Style

Ovary

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