Some unique features of this book are: Content has been written in a simple and easy-to-understand language. New terms have also been highlighted and explained. At the beginning of each chapter, sub-topics have been given to provide an overview of the concepts covered. Coloured pictures, hand-made illustration, well-labelled diagrams and flow charts have been incorporated for clear understanding. Highlighted boxes contain important information and interesting facts related to the topic. Mind maps given at the end of each chapter help to organise and summarise the information of the chapter for better recapitulation. For through learning and self-evaluation, different types of questions, like multiple choice questions, fill in the blanks, true or false, match the following,, name the following, diagram based question and short answer questions have been given at the end of the chapters. A number of activities have been given in each chapter for understanding of the concepts. We hope that this book proves useful to both students and teachers because of its simple language and clarity of concepts.

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