Download the official CBSE Class 11 Biology Syllabus for 2025-26. Get detailed chapter-wise marks distribution, practical exam blueprint, and deleted topics for NEET preparation.
Class 11 Biology is the gateway to your medical career. With Unit V (Human Physiology) carrying the highest weightage of 18 marks, understanding the official curriculum is crucial for both Board Exams and NEET.
Below is the detailed CBSE Class 11 Biology Syllabus 2025-26, updated with the latest Rationalised NCERT guidelines. This guide breaks down the theory weightage, practical exam blueprint, and chapter-wise topics.
⚠️ Syllabus Update for 2025-26
The syllabus remains strictly based on the Rationalised NCERT textbook.
Note: Chapters like “Digestion and Absorption”, “Transport in Plants”, and “Mineral Nutrition” are DELETED and will not be asked in the annual exam.
CBSE Class 11 Biology Syllabus 2025-26 Marks Distribution (Theory)
The theory paper is worth 70 Marks. Students targeting NEET or high board scores must prioritize Unit V and Unit III.
| Unit | Unit Title | Weightage |
|---|---|---|
| I | Diversity of Living Organisms | 15 Marks |
| II | Structural Organisation in Plants and Animals | 10 Marks |
| III | Cell: Structure and Function | 15 Marks |
| IV | Plant Physiology | 12 Marks |
| V | Human Physiology (High Priority) | 18 Marks |
| Total Theory Marks | 70 Marks | |
Detailed Unit-wise Syllabus Topics
To avoid wasting time on deleted content, study only the chapters listed below. We have grouped them by unit.
- The Living World: Biodiversity, Taxonomy and Systematics, Binomial nomenclature.
- Biological Classification: Five Kingdom classification (Monera, Protista, Fungi, Animalia, Plantae).
- Plant Kingdom: Algae, Bryophytes, Pteridophytes, Gymnosperms, Angiosperms.
- Animal Kingdom: Non-chordates and Chordates (up to class level).
- Morphology of Flowering Plants: Inflorescence, Flower, Fruit, Seed (Root/Stem/Leaf modifications are deleted in some versions, check school specifics).
- Anatomy of Flowering Plants: Tissues (Meristematic and Permanent).
- Structural Organisation in Animals: Morphology, anatomy, and functions of digestive, circulatory, respiratory, nervous, and reproductive systems of an insect (Frog).
This unit is the foundation for Class 12 Genetics.
- Cell – The Unit of Life: Prokaryotic vs Eukaryotic cells, Cell membrane, Cell organelles (Endomembrane system, Mitochondria, Plastids, Ribosomes, Nucleus).
- Biomolecules: Proteins, Carbohydrates, Lipids, Nucleic acids, Enzymes (Action and properties).
- Cell Cycle and Cell Division: Mitosis and Meiosis significance.
- Photosynthesis in Higher Plants: Light reaction, Electron transport, C3 and C4 pathways.
- Respiration in Plants: Glycolysis, Fermentation, TCA cycle, Electron Transport System (ETS).
- Plant Growth and Development: Growth regulators (Auxin, Gibberellin, Cytokinin, Ethylene, ABA).
Note: Digestion is deleted. Focus on the following systems:
- Breathing and Exchange of Gases: Respiratory organs, Mechanism of breathing, Gas exchange.
- Body Fluids and Circulation: Blood, Lymph, Human Circulatory System (Heart), ECG.
- Excretory Products and their Elimination: Urine formation, Regulation of kidney function.
- Locomotion and Movement: Skeletal muscle contraction, Skeletal system.
- Neural Control and Coordination: Neuron, Nerve impulse transmission, CNS.
- Chemical Coordination and Integration: Endocrine glands and Hormones.
Class 11 Biology Practical Exam Blueprint (30 Marks)
The practical exam is conducted by your school. A neat practical record is mandatory for full marks.
| Evaluation Item | Marks |
|---|---|
| One Major Experiment (Part A) (e.g., Potato Osmometer, Urine Test) |
5 |
| One Minor Experiment (Part A) | 4 |
| Slide Preparation (Part A) (e.g., Mitosis stages, T.S. of Stem) |
5 |
| Spotting (Part B) (Identification of 7 spots) |
7 |
| Practical Record + Viva Voce | 4 |
| Project Record + Viva Voce | 5 |
| Total | 30 |