Angiosperm Sexual Reproduction
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Angiosperms are plants which have flowers and fruit. First, a pollen grain from the anther, or the male part of the flower, is transferred to the stigma, usually by a pollinator such as a bee or a butterfly. The pollen grain has two cells: a tube cell and a generative cell.
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Once the pollen binds to the stigma, a pollen tube, or a pathway down the style, forms from the tube cell. The generative cell then produces two sperm, which travel down the pollen tube to the ovary, where one sperm fertilizes the egg to form a zygote, and the other fuses with the diploid central cell to create a triploid cell, in a process of double fertilization. The triploid cell develops into the endosperm, which acts as food for the growing plant embryo.