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This edition have been advanced according to suggestions and need of the students and teachers. Since many State Boards and CBSE have been adopted NCERT books as standard for their board examinations. Keeping in view this change, we have written this textbook for class X students. During the writing of this book we always remained conscious of difficulties of students and have tried to provide a simple, well-illustrated and up-to-date information of the subject. No originality is claimed in the account of this book. This book is a compilation from different sources like several modern and classical books including NCERT books.