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pollination may be self pollination or cross pollination. in self pollination, the pollen grains of the flower falls on the ovary. it occurs in bisexual flowers.

in cross pollination, the pollen grains of one flower reaches the ovary of another flower through air, or insects or water. thus the reached pollen grain produces a pollen tube into which the male gamete enter. it reaches the ovule and fertilize with it to produce a diploid zygote.

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15y ago

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