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Mention the reasons for difference in pl...

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

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Zygote is formed due to fusion of two haploid (n) gametes, hence it is diploid (2n). Endosperm develops from triploid (3n) primary endosperm nucleus formed due to fusion of male gamete (n) and two polar nuclei (n)
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