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Why is fertilization in an angiosperm referred to as double fertillization ? Mention the ploidy of the cells involved.

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Fertilization of haploid egg cell by one haploid male gamete, to form diploid zygote, is called syngamy. Fertilization of two polar nuclei by the other haploid male gamete, to from triploid primary endosperm nucleus, is called triple fusion. The fertilization thus occurs twice in the embryo sac. Therefore it is called as double fertilization.

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