(D) In angiosperms,during double fertilization,one of the male gametes fuses with the two polar nuclei located in the central cell to form a triploid

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(D) In angiosperms,during double fertilization,one of the male gametes fuses with the two polar nuclei located in the central cell to form a triploid $(3n)$ structure known as the Primary Endosperm Nucleus $(PEN)$.This process is called triple fusion.The $PEN$ subsequently develops into the endosperm,which provides nourishment to the developing embryo.