This comprehensive biology textbook set is essential for students of class 11. Divided into two volumes, it covers the complete syllabus prescribed by various boards. The chapters are presented in a clear and student-friendly manner, using accurate diagrams and flowcharts to simplify complex concepts. Key concepts are reinforced through numerous solved examples and practice questions at the end of each chapter to help students prepare thoroughly for their exams. This extensively revised edition incorporates the latest developments and updates in the field of biology to give students an in-depth understanding of the subject. Its detailed treatment of topics will help lay a strong foundation for advanced studies in medical and biological sciences.