Process of formation of new organism by an organism of same species without involvement of gametes is called as asexual reproduction. 22

The transfer of pollen grains from anther to stigma is known as pollination. 27

When pollination involves only one flower or two flowers borne on same plant, it is called as self-pollination. 27

When pollination involves two flowers borne on two plants of the same species, it is cross-pollination. 27

Formation of zygote by union of sperm and ovum is called as fertilization. 29

Excessive growth of population within short duration is called as population explosion. 34