short note on embryo sac and endosperm
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embryo sac A large cell that develops in the ovule of flowering plants. It is equivalent to the female gametophyte of lower plants, although it is very much reduced. Typically, it contains eight nuclei formed by division of the megaspore mother cell (see illustration).
The endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization. It is triploid (meaning three chromosome sets per nucleus) in most species. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.
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