Question

in which movement pollen enter the ovum?
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Answer 1

It acts as a conduit 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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Answer 2

when the pollen grains reach the stigma they develop pollen tubes which penetrated into ovary and they release their two nucleus for the fertilisation....