Definitions / Explanation : Double Fertilisation

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$\rightarrow$ In angiosperms among two male gametes, one of the male gametes fuses with egg cell and forms a zygote while the other male gamete fuses with the diploid secondary nucleus and forms triploid primary endosperm nucleus $(PEN)$ . This involvement of two fusions, is called double fertilisation.

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  • [AIPMT 1990]

Double fertilization is fusion of