How are polar nuclei formed in an embryosac?
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The megasporocyte undergoes a meiotic cell division, producing four haploid megaspores. Only one of the four resulting megaspores survives. This megaspore undergoes three rounds of mitotic division, resulting in seven cells with eight haploid nuclei (the central cell has two nuclei, called the polar nuclei).
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Polar nuclei two haploid nuclei inside the mid region of the embryo Sac of a flowering plant which fuse with another nuclues (1 or 2 sperm nucleus) to form the triploid endosperm.
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