With the introduction of the `Core Curriculum` of Biology at the National level and its acceptance by The Central Board of Secondary Education (CBSE), a need was felt for such a text book of Biology which will be useful to the students preparing for Std XI Examination and equip them with the conceptual background and adequate depth of the subject. In short, a text book of Biology which will endow them with self confidence to face the challenges of academic and professional courses after the +2 stage.

The present text book of Biology for Std. XI is designed keeping these facts in mind. It is written strictly according to the Syllabus ofCBSE based on the `Common Core Curriculum` and NCERT Guidelines.

• The text is divided into in all 26 chapters under five units. Each chapter is followed by Summary. The Exercises include different types of questions such as long answer type, short answer type, true or false, fill in the blanks and the multiple choice questions for revision and practice.
• The text in each chapter includes all the necessary details as per the scope of the syllabus and as required for the Board Examination as well as for the Medical Entrance Examination at the State and the National Levels.
• There is no substitute for simplified, clear, bold and well labeled line diagrams in biology. Hence, the same are lavishly included in the text. A few coloured diagrams and photographs are also included.
• The presentation of the text matter is of prime importance in deciding the quality of a text book. We have tried to present the text in most simple, straight and lucid language which will make it easy for the students to follow and understand.
• This text book will be most helpful and adequate for the students not only at the Board Examination level but also for the preparation of the Medical Entrance Examination both at the State as well as the National Level.

Contents :

UNIT − I : DIVERSITY OF LIVING ORGANISMS
1. MEANING OF BEING ALIVE
2. SYSTEMATICS
3. FIVE KINGDOM CLASSIFICATION
4. KINGDOM PLANTAE (Complex Autotrophs)
5. CLASSIFICATION OF ANIMALS
UNIT − II : STRUCTURAL ORGANIZATION IN ANIMALS AND PLANTS
6. MORPHOLOGY OF FLOWERING PLANTS
7. ANATOMY OF ANGIOSPERMS
8. STUDY OF ANIMAL TISSUES
9. STUDY OF ANIMAL TYPE - COCKROACH
UNIT − III : CELL: STRUCTURE AND FUNCTION
10. CELL: STRUCTURE AND FUNCTION
11. CHEMICAL CONSTITUENTS OF LIVING CELLS
12. CELL DIVISION
UNIT − IV : PLANT PHYSIOLOGY
13. TRANSPORT IN PLANTS
14. PLANT-WATER RELATIONS
15. MINERAL NUTRITION
16. NITROGEN METABOLISM
17. PHOTOSYNTHESIS
18. PLANT RESPIRATION
19. PLANT GROWTH AND DEVELOPMENT
UNIT − V : HUMAN PHYSIOLOGY
20. DIGESTION AND ABSORPTION
21. BREATHING AND RESPIRATION
22. BODY FLUIDS AND CIRCULATION
23. EXCRETORY PRODUCTS AND THEIR ELIMINATION
24. LOCOMOTION AND MOVEMENT
25. NEURAL CONTROL AND CO-ORDINATION
26. CHEMICAL COORDINATION AND REGULATION
BIBLIOGRAPHY