Biology is a very popular subject among the students. Many students take a keen interest in Biology as it is considered as a foundation stone in a Medical Career. Study of Plants, Animals, Dissection of Animals, Study of Tissue, Life Cycles and Classification of Plants and Animals all one important for students. This Encyclopaedia distresses the various aspects of Biological Science. It has been prepared for all Medical students keeping in mind their needs and requirements. Today biological science is rising on a wall of worry. No other science has advanced more dramatically during the past several decades nor yielded so many palpable improvements in human welfare. Thus it is aimed at a broad range of readers. This book differs from the other books in its central concern with "statement about the future" as made by a wide range of scientists. The subject areas covered are extensive and specialists in every field will find materials than can be improved and extended. This encyclopaedia is an effort to summarize the basic concept and principles of the subject, to present the elementary factual information with which a person to be competent in the filed should be familiar, and to sow how these principles and facts may be applied in a practical way to the interests and welfare of Students."