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In a fertilised embryo sac, the haploid, diploid and triploid structures are:
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Antipodal, zygote and primary endosperm nucleus
Embryo sac is made up of 7 cells. Three antipodal cells, one central cell, two synergids and one egg cell. These antipodal cells are haploid and they degenerate after fertilization, central cell bear two haploid nuclei and post second fertilization central cell becomes triploid endosperm. Egg cell after first fertilization becomes diploid zygote whereas synergids always remain haploid.
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