Embryo sac is the female gametophyte. It is an eight nucleated structure consisting of egg apparatus, polar nuclei and antipodal cells.
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Egg Apparatus: After fertilization, gives rise to diploid zygote which later on develops into an embryo.
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Polar nuclei: The two polar nuclei fuse to form single diploid secondary nucleus. The secondary nucleus forms the triploid endosperm nucleus, which produces endosperm in which food for the embryo is stored.
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Antipodal cells: These are nutritive cell. They degenerate during seed formation.
