Double fertilization is:
Fusion of two male gametes of a pollen tube with two different eggs
Fusion of one male gamete with two polar nuclei
Fusion of two male gametes with one egg
Syngamy and triple fusion
Double fertilisation is a unique phenomenon in flowering plants involving two fusion events within the embryo sac. It consists of syngamy, where one male gamete fuses with the egg cell to form a diploid zygote, and triple fusion, where the second male gamete fuses with the two polar nuclei in the central cell to produce the triploid primary endosperm nucleus (PEN) .
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