in Sexual reproduction in flowering plants by

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The ovules are the numerous small rounded bodies distributed in the placenta of the ovary.

Whereas the each ovule has a single sac like structure called embryo sac which is called the female gametophyte. The embryo sac is a seven celled eight nucleated structure which consists of the three celled egg apparatus, three antipodals and a bi nucleated central cell. The egg apparatus consist of fertile egg which is the female gamete.