Question

what is self pollination and cross pollination

Answer 1

when pollination occurs in same plant then its called self pollination.
when pollinatiom occurs in plants which are far away then its called cross pollination and there are agents which take the pollen grain to the flowers these are insects,,water and air.

Answer 2

Here's your answer : 
Self pollination is the transfer or pollen from its own anther to the stigma of the same flower , or to another flower of the same plant.
Cross pollination is the transfer of pollen from the anther of a flower to the stigma of a flower on a different plant of the same species.
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