Question

define pollination and fertilisation

Answer 1

pollination is the transfer of pollen from the anther (male organ of the flower) to the stigma (female organ of the flower) of the same or different flower. Secondly, 

fertilization occurs once the pollen grain reaches the stigma, it produces a pollen tube, which grows down through the style to the ovary.

Answer 2

POLLINATION :-Pollination is a transfer of pollen from anther (male organ of flower)to the stigma (female organ of flower ) of the same or different flower.
FERTILISATION :-Fertilisation occurs once the pollen grain reaches the stigma, it produces the pollen tube,which grows down through the style to the ovary