Fertilization

Fertilization

When a pollen grain lands on the stigma of a flower of the same species, a pollen tube grows down the style to the ovary and one male nucleus from the pollen tube fuses with the egg cell, while a second male nucleus fuses with another part of the female gametophyte to form a food supply for the seed called the endosperm. Then the wall of the ovule hardens to form the seed coat and changes occur in the ovary which develops into a fruit. [CH] {EB}