It gives us immense pleasure in presenting the thoroughly revised update edition of the book prepared strictly in accordance with the latest syllabus and its scope. The distinctive features of the book are :
1. The text is presented in the simplest language “meant to understand easily”.
2. Quick self assessment questions with answers given at the end of chapter between the chapter to assess the understanding of students.
3. A number of illustrations have been given in each chapter and these have been presented in such a simple way that students can easily understand them.
4. Practical questions given at the end of each chapter are based on ISC and CBSE Board Examination papers and these are numbered according to illustrations.
5. Each chapter has been uniformly organised under head ‘Self Assessment Questions’ viz., Long Answer Questions (Practical), Short Answer Questions (Practical) and Short Answer Questions (Theoretical).
6. Chapterwise Higher Order Thinking Skills Problems with solutions are given at the end of book under the heading ‘Assess Yourself’.
We take this opportunity to thank all readers who spared their valuable time in making suggestions for improving the quality of the book.