The present book provides information about the zoological as well as botanical aspects of life. The subject material of the book is divided into seven chapters. Chapter 1 covers the world of living and life processes, chapter 2 and 3 present the control, co-ordination and reproduction in animals and plants, chapter 4 covers the basic concepts of evolution, sex determination and origin of life, chapter 5 deals with sources, forms and utilization of energy, chapter 6 and 7 cover the environment and management of natural resources. The most important feature of this book is that we have included a different types of questions with remember sockets in the last of each chapter from core material for evaluating the learning skill of the students. The language of book is very plain and diagrams are keeping to the simple with concept maps to understanding the student's easily during the study. Thus, this book can be used as a basic subject material for the students and teachers in academics and technical institutes.