Biology, the branch of science that deals directly with all living beings, has possibly the most palpable and immediate impact on the society. The gradual metamorphosis of biology from an amorphous philosophy of nature to an arena with multiple specialized sub branches has spanned over a course of centuries, and the society has felt the implications of each and every turn that this course has taken. There were times when the concept of disease ad medicine was non existent and ailment was attributed to supernatural powers. Epidemics like plague and small pox resulted in the annihilation of populations. But biologists and physicians have alleviated this virtually indomitable problem by developing medicines and anti-dotes for all kinds of diseases.