There are two kinds of pollination. They are self pollination and cross pollination.
Self pollination is the transference of the pollen grains from the other to the stigma of the same flower or another flower of the same plant is involved.
Some of the pollen grains are dropped on the stigma of the same flower with the help of wind or a nectar-seeking insect. In other cases the insect flies from one flower to another flower of the same plant and deposits the pollen grains on the stigma of the second flower.
Cross pollination is when the pollen grains are transferred from the other of one plant to the stigma of another flower of another plant. So there are two parent plants involved.
Pollination takes place among plants of the same or allied species.
The agents of pollination are insects (like the bees, butterflies, moths and flies), birds, animals, wind and water.
