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  4. Primary endosperm nucleus (PEN) is formed by the fusion of

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Q. Primary endosperm nucleus (PEN) is formed by the fusion of

AIIMSAIIMS 2015Sexual Reproduction in Flowering Plants

Solution:

During the event of double fertilisation in angiosperms, the second male gamete fuses with the two haploid polar nuclei or diploid secondary nucleus of the central cell to form a triploid primary endosperm nucleus (PEN). This second fertilisation is called vegetative fertilisation.