Endosperm is the tissue produced in the seeds of most flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein. Endosperm is formed when the two sperm inside a pollen grain reach the interior of an embryo sac or female gametophyte. One sperm fertilizes the egg, forming a zygote, while the other sperm usually fuses with the two female nuclei at the center of the ovary, creating endosperm.


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