Are pollen grains released from a flower?
Sorry but for a better answer you might want to look at another source wiki answers isn't alwaysa reliable source.
Cross-pollination: As the insect moves from flower to flower gathering pollen (to make honey), they brush up against the flower's stamen and anthers. Pollen is deposited on the body of the insect by the anther, when it moves to another flower the pollen grains are "captured" by the sticky stigma (of the receptive flower). The pollen grain germinates on the stigma and the pollen tube grows into the ovary of the receptive flower where it…
Self pollination When pollen grains from a flower are carried to the stigma of the same flower or on the other flower of the same plant, the phenomenon is called self pollination. Cross pollination When the pollen grains from a flower are carried to the stigma of the flower on other plant, the phenomenon is called cross pollination.