Depending on the source of pollen grains, pollination are of following types :
(a) Autogamy : Where pollen of a flower reaches the stigma of the same flower.
(b) Geitonogamy : Pollen grain of one flower reaches the stigma of another flower of same plant.
(c) Cross-pollination or Xenogamy : When pollen grain of a flower from one plant pollinates the stigma of a flower on another plant.
