Diagram of germination of pollen on the stigma

i) Ovary – The ovary is part of the carpel which is the female reproductive part of a plant. The ovary encloses the ovules that get fertilized by the pollen grains.

ii) Male germ cell – The male germ cells are present in the pollen grains. After pollination, the male germ cells travel towards the female germ cells in the ovary through the pollen tube germinating from the pollen grains.

iii) Female germ cell – Female germ cells are present in the ovary of the plant. These cells fuse with the male germ cells to give rise to a zygote that eventually forms the embryo.

iv) Ovules – The ovule is present inside the ovary and it grows into a seed after it is fertilized by the male germ cells.