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(C) Double fertilization is a unique phenomenon in angiosperms. It involves two fusion events:$1$. Syngamy: One male gamete fuses with the egg cell to

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Endosperm

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(C) Double fertilization is a unique phenomenon in angiosperms. It involves two fusion events:$1$. Syngamy: One male gamete fuses with the egg cell to form a diploid zygote $(2n)$,which develops into the embryo.$2$. Triple Fusion: The second male gamete fuses with the two polar nuclei (or the secondary nucleus) to form the primary endosperm nucleus $(PEN)$,which is triploid $(3n)$.The $PEN$ subsequently develops into the endosperm,which provides nutrition to the developing embryo. Therefore,double fertilization is essential for the formation of the endosperm.

Double fertilization is essential for the formation of:

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