CBSE Class 10 Science Syllabus 2025-26
Official chapter-wise syllabus for CBSE Class 10 Science — unit-wise marks distribution, list of deleted/reduced topics, and the 2025-26 exam paper pattern. Use this page alongside the Class 10 Science preparation guide for full exam readiness.
2025-26
Academic Year
80
Theory Marks
20
Practical Marks
13
Total Chapters
Unit-Wise Marks Distribution
80 marks (theory)Unit I: Chemical Substances
Chemical Reactions and Equations · Acids, Bases and Salts · Metals and Non-metals · Carbon and its Compounds
31% of theory marks
Unit II: World of Living
Life Processes · Control and Coordination · How do Organisms Reproduce? · Heredity and Evolution
29% of theory marks
Unit III: Natural Phenomena
Light – Reflection and Refraction · Human Eye and Colourful World
15% of theory marks
Unit IV: Effects of Current
Electricity · Magnetic Effects of Electric Current
16% of theory marks
Unit V: Natural Resources
Our Environment
9% of theory marks
Chapter-Wise Syllabus
13 chapters| # | Chapter | Marks |
|---|---|---|
| 1 | Chemical Reactions & Equations | 6 |
| 2 | Acids, Bases & Salts | 6 |
| 3 | Metals & Non-metals | 6 |
| 4 | Carbon & Its Compounds | 6 |
| 5 | Life Processes | 10 |
| 6 | Control & Coordination | 7 |
| 7 | Reproduction | 8 |
| 8 | Heredity & Evolution | 5 |
| 9 | Light — Reflection & Refraction | 7 |
| 10 | Human Eye & Colourful World | 5 |
| 11 | Electricity | 7 |
| 12 | Magnetic Effects of Current | 5 |
| 13 | Our Environment | 4 |
Deleted / Reduced Topics 2025-26
Note: The following topics have been deleted or reduced from the CBSE Class 10 Science syllabus. Do not spend time studying these for the 2025-26 board exam. Always verify with the official CBSE syllabus document before your exam.
Periodic Classification of Elements
Entire chapter removed from CBSE 2025-26 Class 10 Science board exam
Sources of Energy
Entire chapter removed from CBSE 2025-26 Class 10 Science board exam (formative only)
Management of Natural Resources
Entire chapter removed from CBSE 2025-26 Class 10 Science board exam (formative only)
Heredity and Evolution
Evolution and classification — some portions reduced
Exam Paper Pattern 2025-26
80 marks total| Section | Marks/Q | Count | Total | |
|---|---|---|---|---|
| Section A | 1 | 20 | 20 | |
| Section B | 2 | 5 | 10 | |
| Section C | 3 | 6 | 18 | |
| Section D | 5 | 4 | 20 | |
| Section E | 4 | 3 | 12 | |
| Total Theory Marks | 80 | |||
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 10 Science syllabus, with AI evaluation against the official marking scheme.