Definitions for pollination
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transfer of pollen from the anther to the stigma of a plant
the transfer of pollen from an anther to a stigma; effected by insects, birds, bats and the wind etc.
Pollination is the process by which pollen is transferred in the reproduction of plants, thereby enabling fertilization and asexual reproduction. In spite of a common perception that pollen grains are gametes, like the sperm cells of animals, this is incorrect; pollination is a phase in the alternation of generations. Each pollen grain is a male haploid plant, a gametophyte, adapted to being transported to the female gametophyte, where it can achieve fertilization by producing the male gamete. As such the Angiosperm successful pollen grain containing the male gametes gets transported to the stigma, where it germinates and its pollen tube grows down the style to the ovary. Its two gametes travel down the tube to where the gametophyte containing the female gametes are held within the carpel. One nucleus fuses with the polar bodies to produce the endosperm tissues, and the other with the ovum to produce the embryo Hence the term: "double fertilization". In gymnosperms the ovule is not contained in a carpel, but exposed on the surface of a dedicated support organ such as the scale of a cone, so that the penetration of carpel tissue is unnecessary. Details of the process vary according to the division of Gymnosperms in question.
U.S. National Library of Medicine
The transfer of POLLEN grains (male gametes) to the plant ovule (female gamete).
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