This book entitled Biosphere deals with our environment. It includes all aspects of ecosystem, i.e. aquatic and terrestrial ecosystem and soil. This book also gives description of interrelation among animals and other aspects. In modern time, pollution has become a great problem and it has arrested human life in all aspects. So this book also deals the problem of problem. The publication of this book is according to the syllabi for B.Sc. as well as M.Sc. students of Indian Universities. Many other books published on this topic is said to include some of Indian types and not all, so effort is taken to explain almost all the important Indian types. Efforts have also been taken into consideration to condense the matter as far as practicable. It is hoped that this book will meet all the requirements of students.