Pollination by insects
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.
Wind pollination
Most plants need help moving pollen from one flower to the pistil of another. Wind moves the pollen for some plants such as grasses like corn. Animal pollinators move pollen for many other flowering plants. An animal that moves pollen from the anthers to the stigmas of flowers, thus effecting pollination. Animals that are known to be good pollinators of flowers include bees, butterflies, hummingbirds, moths, some flies, some wasps, and nectar feeding bats. They pollinate to get nectar and/or pollen from flowers to meet their energy requirements and to produce offspring. In the economy of nature, the pollinators provide an important service to flowering plants, while the plants pay with food for the pollinators and their offspring.
Transfer of pollen from an anther to a stigma of the same flower is known as self–pollination. Cross pollination is the transfer of pollen grains from the anther of a flower to the stigma of a flower of a different plant of the same species. Artificial Pollination helps increase seed numbers, fruit size and dry matter.