what role do the pollen grains play in the reproduction of plants
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The main function is to deliver male gametes (sperm) from the stamen of a plant to ovule for fertilization of an egg, which then develop into a seed.
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Pollen tubes act as conduits to transport male gametes cells from the pollen grains either from the stigma ( in flowering plant) to the ovule at the base of the pistil or directly through tissue in some gymnosperms. Pollen grains have separate structure such as microsporocytes and megasporoyctes
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