Pollination in angiosperms could occur in the following ways:

1. Self-pollination - 
(a) Autogamy - When the transfer of pollen grain takes place from the anther to the stigma of the same flower of the same plant.

(b) Geitonogamy - When the transfer of pollen grain takes place from the anther of one flower to the stigma of another flower on the same plant.

2. Cross-pollination (Xenogamy/Allogamy) - When transfer of pollen grain takes place from the anther of a flower of one plant to the stigma of a flower of the another plant belonging to the same species. Cross pollination can be accomplished through some biotic or abiotic agents. Based on the agents used for cross-pollination to occur, they may be of the following kinds:
(a) Anemophily - pollination by wind
(b) Hydrophily - pollination by water
(c) Entomophily - pollination by insects
(d) Zoophily - pollination by animals
(e) Chiropterophily - pollination by bats
(f) Myrmecophily - pollination by ants
(g) Malacophily - pollination by snails
(h) Ornithophily - pollination by birds