Pistil is the female reproductive structure which is distinguished into three parts; ovary, style and stigma. The process of fertilization occurs in the pistil; after fertilization the ovule becomes the seed and ovary form the fruit. The pollen falls on the stigma and germination occurs on the stigmatic surface resulting in the formation of the pollen tube. The pollen tube passes through the style and reaches the embryo sac of the ovule and releases the male gametes. The fusion of male and female gametes occurs in the embryo sac resulting in the formation of zygote.