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 · Periodic Classification of Elements
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
Sources of Energy · Our Environment · Management of Natural Resources
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 & Management | 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
Mendeleev's Periodic Table (detailed history)
Heredity and Evolution
Evolution and classification (some portions)
Management of Natural Resources
Regional case studies on water harvesting
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.