In angiosperms,the endosperm is formed by:

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(D) In angiosperms,the process of double fertilization occurs. One male gamete fuses with the egg cell to form a zygote $(n + n = 2n)$. The second mal

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Division of fused polar nuclei and male gametes

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(D) In angiosperms,the process of double fertilization occurs. One male gamete fuses with the egg cell to form a zygote $(n + n = 2n)$. The second male gamete fuses with the two polar nuclei (or the secondary nucleus) to form the Primary Endosperm Nucleus $(PEN)$. This process is known as triple fusion $(n + n + n = 3n)$. The $PEN$ subsequently undergoes repeated mitotic divisions to form the endosperm,which provides nutrition to the developing embryo.

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