Why cannot fertilisation take place in flowers if pollination does not occur?

(N/A) Fertilisation is the process of fusion of male and female gametes. In flowering plants,the male gametes are contained within the pollen grains. Pollination is the transfer of pollen grains from the anther to the stigma of a flower. If pollination does not occur,the male gametes cannot reach the female gametes present in the ovary. Therefore,without the presence of male gametes,fertilisation cannot take place.