Biology, the word comes from Greek bios meaning life and logos meaning thought or science of, can be defined as the study of various aspects of living beings (animals and plants). It is the study of life from the simplest forms of plants and animals to highly complex structures of human beings, Biology is also called life science as it makes to understand how living things perform their activities and interact with the other living things. Main branches of biology are botany, zoology and microbiology. Pure biology is concerned with gaining fundamental knowledge of the subject and studied only for better understanding of natural phenomenon. It has no direct practical application in human welfare (e.g taxonomy). Applied biology is related to well bring of man kind and is directly beneficial economically. Some of them are agriculture, biotechnology, sericulture, bioinformatics etc.