Double Fertilization Mechanism
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State
An angiosperm's pollen tube delivers two sperm cells: one fertilizes the egg, forming the embryo; the other fuses with two nuclei, forming endosperm.
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Endosperm becomes the corn kernel's starchy tissue, a nutrient store from this second fertilization, distinct from the embryo.
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Double fertilization is unique to angiosperms — no gymnosperm lineage performs this two-sperm event.