The process in which pollen grains from the anther are transferred to the stigma resulting in fertilization and further seed production is referred to as pollination.
In bisexual or monoecious plants, self-pollination takes place, i.e., the transfer of pollen grains from the anther to the stigma of the same plant.
In unisexual or dioecious plants, cross-pollination occurs, in which pollen grains are transferred to the stigma of some other plant of the same species.
Cross-pollination is induced by various agents of pollination such as animals, wind, water, insects, etc.
Pollination in the grass:
In grasses, pollination is induced by winds, which is called anemophily.
The pollen grains of grasses are light feathery, and un-sticky thus favoring wind pollination.