Question

what is pollination and describe their types

Answer 1

There are two types of pollination, called self-pollination and cross-pollination. 

Answer 2

Transfer of spores from androceium to gynoceium is known as pollination.

There are 2 types: 1)Self pollination 2)cross pollination

1) self pollination:

It happens between the androceium and gynoceium of the same flower

2)cross pollination:

It happens between the androceium and gynoceium of different flowers or of different plants.
Sometimes Cross pollination is done by the honey bees, butterflies etc........

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