The process of transfer of the pollen grains from the anther to the stigma is known as pollination .
Are of two types:
(A) Self pollination: It occurs in bisexual flowers. It is of two types:
Type 1 - It happens within the same flower. Pollen from the anther is transferred to the stigma of the same flower.
Type 2 - It occurs between two flowers of the same plant.Pollen from the anther of one flower is transferred to the stigma of another flower in the same plant.
(B). Cross pollination: It can occur in both unisexual and bisexual flowers.
In this type of pollination, pollen is transferred from the anther of one flower of one plant to stigma of another flower of another plant.