Explanation

Pollination is a process of transfer of pollen grains from an anther to the stigma of the same flower or of different flower. Pollination may be self pollination (or autogamy), $i.e,\$(transfer of pollen grains from anther to the stigma of same flower) or cross pollination (or allogamy), $i.e.,$ transfer of pollen grains to the stigma of different flower. Some agencies used in cross pollination are: 1.Insects (Entomophily) 2.Wind (Anemophily) 3.Water (Hydrophily) 4.Birds (Ornithophily) 5.Bats (Cheitropterophily).