Sperm in plants
Sperm cells in algal and many plant gametophytes are produced in male gametangia (antheridia) via mitotic division.
Double fertilization
Lab Manual Exercise #8
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Description:Advanced Search Abstract Although most people think of pollen merely as an allergen, its true biological function is to facilitate sexual reproduction in flowering plants. The angiosperm pollen grain, upon arriving at a receptive stigma, germinates, producing a tube that extends through the style to deliver its cargo to the ovule, thereby fertilizing the egg, and completing the life cycle of the plant. The pollen tube grows rapidly, exclusively at its tip, and produces a cell that is highly polarized both in its outward shape and its internal cytoplasmic organization. Recent studies reveal that the growth oscillates in rate.
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