The union of a sperm cell with ________ of the female gametophyte is referred as double fertilization.

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Double fertilization is the process by which two sperm cells from the male gametophyte fertilize two cells in the female gametophyte. One sperm cell fertilizes the egg cell to form the zygote, while the other sperm cell fuses with the two polar nuclei to form a triploid cell that develops into the endosperm. Therefore, the union of a sperm cell with two polar nuclei of the female gametophyte is referred to as double fertilization.

The Union of a Sperm Cell with ________ of the Female