Double fertilization is the fusion of:

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(D) Double fertilization is a characteristic feature of angiosperms.It involves two fusion events:$1$. Syngamy: One male gamete fuses with the egg cel

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One male gamete with egg cell and another with secondary nucleus

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(D) Double fertilization is a characteristic feature of angiosperms.It involves two fusion events:$1$. Syngamy: One male gamete fuses with the egg cell to form a diploid zygote $(n + n = 2n)$.$2$. Triple Fusion: The second male gamete fuses with the two polar nuclei (or the secondary nucleus) to form a triploid primary endosperm nucleus $(n + 2n = 3n)$.Thus,double fertilization is the fusion of one male gamete with the egg cell and another male gamete with the secondary nucleus.

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