PollinationPollination is the mechanical transfer of pollen grains from an anther to a stigma, the receptive end of a carpel. Pollination is accomplished by a variety of physical dispersal agents such as wind, water, and gravity or many kinds of animals including insects, bats, birds, and small rodents. The variations in floral structure are, in large part, adaptations to achieve pollination success. Most pollination is between flowers located on separate plants ( cross-pollination), but in some taxa self-pollination occurs when pollen from the anthers falls on stigmas of the same plant. FertilizationIf the pollen grain lands on the stigma of a genetically compatible flower, it absorbs moisture and a pollen tube emerges through a pore in the wall. The germinated pollen grain with its pollen tube and three nuclei is the
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