what are pollen grain and ?how is a pollen grain tube fromed ?
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Pollen tubes are produced by the male gametophytes of seed plants. Pollen tubes act as conduits to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms.
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Pollen grains are the male reproductive organism which are found in the stamen of the male reproductive parts. Pollen tubes are formed when it starts to go through the stigma, style till it reaches the ovules to form into pollen tubes and cause fertilization.
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