Triple fusion is characteristic of

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(D) Triple fusion is a unique process that occurs during the double fertilization of angiosperms.In this process,one of the two male gametes fuses wit

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Angiosperms

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(D) Triple fusion is a unique process that occurs during the double fertilization of angiosperms.In this process,one of the two male gametes fuses with the two polar nuclei (or the secondary nucleus) located in the central cell of the embryo sac.This fusion results in the formation of a triploid $(3n)$ primary endosperm nucleus $(PEN)$.Since this process involves the fusion of three haploid nuclei,it is termed triple fusion.Therefore,it is a characteristic feature of angiosperms.

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