Pollination is the transfer of pollen from the stamen to the pistil of a flower.
Fertilization is the union of the female reproductive cell in the ovary with the male germ cell from the pollen grain. The simplest of these is self-pollination , whereby pollen from a flower pollinates and fertilizes the ovules of the same flower. Sometimes selfpollinated plants do not require any outside assistance from wind or bees for complete pollination. In the second example, the pollen is transferred from one flower on a plant to another flower on the same plant. This is necessary in many of the vine crops such as cucumbers where male flowers produce only pollen and female flowers have only the pistil.