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Mention the reasons for difference in ploidy of zygote and primary endosperm nucleus in an angiosperm.

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In angiosperms, zygote is diploid while primary endosperm cell is triploid. Explain.

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A zygote is formed by the fusion of haploid male gamete with the haploid egg to form a diploid cell; whereas, primary endosperm nucleus (PEN) is formed by the fusion of haploid male gamete with two haploid polar nuclei, forming a triploid nucleus.

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