Keeping in mind the immense importance and significance of the NCERT Textbooks for a student, Arihant has come up with a unique book containing only and all Question-Answers of NCERT Textbook based questions. This book has been designed for the students studying in Class X following the NCERT Textbook of Science. The present book has been divided into two parts covering the syllabi of Science into Term I and Term II. Term-I covers chapters namely Chemical Reactions & Equations, Acids, Bases & Salts, Metals & Non-Metals, Life Processes, Control & Coordination, Electricity, Magnetic Effects of Electric Current and Sources of Energy. Term-II section covers Carbon and its Compounds, Periodic Classification of Elements, How do Organisms Reproduce, Heredity & Evolution, Light: Reflection & Refraction, Human Eye & Colourful World, Management of Natural Resources and Our Environment. This book has been worked out with an aim of overall development of the students in such a way that it will help students define the way how to write the answers of the textbook based questions. This book has answer to each & every question covered in the chapters of the textbook for Class X Science. Also each chapter in the book begins with a summary of the chapter which will help in effective understanding of the theme of the chapter and to make sure that the students will be able to answer all popular questions concerned to a particular chapter whether it is Long Answer Type or Short Answer Type Question. The book has been designed systematically in the simplest manner for easy comprehension of the chapters and their themes. The book also covers selected NCERT Exemplar Problems which will help the students understand the type of questions and answers to be expected in the actual Class X Science CBSE Board Examination. As the book has been designed strictly according to the NCERT Textbook of Science for Class X and provides a thorough and complete coverage of the textbook based questions, it for sure will help the Class X students in an effective way for Science.