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What is pollination?
The transfer of pollen from the anthers of a flower to the stigma of the same flower or of another flower.  Pollination is a prerequisite for fertilization: the fusion of nuclei from the pollen grain with nuclei in the ovule.  Fertilization allows the flower to develop seeds.
Some flowers will develop seeds as a result of self-pollination, when pollen and pistil are from the same plant, often (but not always) from the same flower.    Other plants require cross-pollination:  pollen and pistil must be from different plants.


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