CBSE Class 11 Biology Syllabus 2025-26
Official chapter-wise syllabus for CBSE Class 11 Biology — unit-wise marks distribution, list of deleted/reduced topics, and the 2025-26 exam paper pattern. Use this page alongside the Class 11 Biology preparation guide for full exam readiness.
2025-26
Academic Year
70
Theory Marks
30
Practical Marks
19
Total Chapters
Unit-Wise Marks Distribution
70 marks (theory)Unit I: Diversity of Living Organisms
The Living World · Biological Classification · Plant Kingdom · Animal Kingdom
21% of theory marks
Unit II: Structural Organisation in Plants and Animals
Morphology of Flowering Plants · Anatomy of Flowering Plants · Structural Organisation in Animals
14% of theory marks
Unit III: Cell: Structure and Functions
Cell: The Unit of Life · Biomolecules · Cell Cycle and Cell Division
21% of theory marks
Unit IV: Plant Physiology
Transport in Plants · Mineral Nutrition · Photosynthesis · Respiration in Plants · Plant Growth and Development
17% of theory marks
Unit V: Human Physiology
Digestion and Absorption · Breathing and Exchange of Gases · Body Fluids and Circulation · Excretory Products and their Elimination · Locomotion and Movement · Neural Control and Coordination · Chemical Coordination and Integration
26% of theory marks
Chapter-Wise Syllabus
19 chapters| # | Chapter | Marks |
|---|---|---|
| 1 | The Living World | 4 |
| 2 | Biological Classification | 5 |
| 3 | Plant Kingdom | 5 |
| 4 | Animal Kingdom | 5 |
| 5 | Morphology of Flowering Plants | 6 |
| 6 | Anatomy of Flowering Plants | 5 |
| 7 | Structural Organisation in Animals | 5 |
| 8 | Cell: The Unit of Life | 6 |
| 9 | Biomolecules | 6 |
| 10 | Cell Cycle and Cell Division | 6 |
| 11 | Photosynthesis in Higher Plants | 6 |
| 12 | Respiration in Plants | 5 |
| 13 | Plant - Growth and Development | 4 |
| 14 | Breathing and Exchange of Gases | 5 |
| 15 | Body Fluids and Circulation | 5 |
| 16 | Excretory Products and Elimination | 4 |
| 17 | Locomotion and Movement | 4 |
| 18 | Neural Control and Coordination | 5 |
| 19 | Chemical Coordination and Integration | 3 |
Deleted / Reduced Topics 2025-26
Note: The following topics have been deleted or reduced from the CBSE Class 11 Biology syllabus. Do not spend time studying these for the 2025-26 board exam. Always verify with the official CBSE syllabus document before your exam.
The Living World
Taxonomical aids — some detailed descriptions
Plant Kingdom
Detailed life cycles of lower plants (selective)
Animal Kingdom
Phylum-wise detailed characteristics (some)
Exam Paper Pattern 2025-26
70 marks total| Section | Marks/Q | Count | Total | |
|---|---|---|---|---|
| Section A | 1 | 16 | 16 | |
| Section B | 2 | 5 | 10 | |
| Section C | 3 | 7 | 21 | |
| Section D | 5 | 3 | 15 | |
| Section E | 4 | 2 | 8 | |
| Total Theory Marks | 70 | |||
Practical / Internal Assessment Marks — assessed throughout the year by your school (projects, lab work, notebooks).
How to Use This Syllabus
Prioritise by marks
Use the unit-wise distribution above. Focus first on units with 20+ marks — they give the best return on study time.
Skip deleted topics
CBSE will not ask deleted topics in the board exam. Don't waste time on them — use that time for NCERT exercises instead.
Know the paper pattern
Section E (Case Study) has new-format questions many students ignore. Practise these separately — they're easy marks.
You know the syllabus. Now practise it.
ClearSteps gives you chapter-wise mock tests aligned to the exact CBSE Class 11 Biology syllabus, with AI evaluation against the official marking scheme.