CBSE Class 10 Science Chapter-Wise Marks: The CBSE Class 10 Board Exam 2026 is a crucial milestone for students, and Science remains one of the most scoring yet challenging subjects. To score high, smart preparation is essential and that starts with understanding the chapter-wise weightage of Class 10 Science.
In this article, you will find:
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Subject-wise & chapter-wise weightage
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High-weightage chapters you must revise with extra care
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Expert-recommended revision strategies
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Exam-oriented tips to maximize marks
This analysis is based on the latest CBSE Class 10 Science Sample Question Paper (2025-26) and observed board exam trends.
CBSE Class 10 Science Marks Distribution (Board Exam 2026)
CBSE Class 10 Science carries a total of 80 marks, divided equally across Biology, Chemistry, and Physics with a clear sectional structure. Understanding this distribution helps students plan subject-wise preparation more effectively.
| Subject | Marks |
|---|---|
| Biology | 30 |
| Chemistry | 25 |
| Physics | 25 |
| Total | 80 Marks |
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CBSE Class 10 Science Chapter-Wise Marks Distribution 2026
Below is explained the chapter-wise weightage for all three sub-parts of Class 10 Science - Biology, Chemistry and Biology:
Section A. Biology Chapter-Wise Weightage (30 Marks)
Biology focuses on life processes, control systems, reproduction, environment, and heredity. Questions are a mix of MCQs, reasoning-based questions, diagrams, and 3–5 mark descriptive answers, mostly from NCERT.
| Biology Chapter | Weightage |
|---|---|
| Life Processes | 10 Marks |
| Control & Coordination | 5 Marks |
| How Do Organisms Reproduce? | 5 Marks |
| Our Environment | 5 Marks |
| Heredity & Evolution | 5 Marks |
Highest Weightage Biology Chapter: Life Processes (10 Marks)
This is the most important Biology chapter, contributing one-third of the total Biology marks.
Revision Tips: Students should revise nutrition, respiration, circulation, excretion, and related diagrams very carefully, as CBSE frequently asks case-based and application questions from this chapter.
Section B. Chemistry Chapter-Wise Weightage (25 Marks)
Chemistry questions test conceptual clarity, chemical equations, reasoning, and numericals. NCERT reactions, properties, and real-life applications are heavily emphasized.
| Chemistry Chapter | Weightage |
|---|---|
| Metals & Non-metals | 12 Marks |
| Acids, Bases & Salts | 7 Marks |
| Carbon & its Compounds | 6 Marks |
Highest Weightage Chemistry Chapter: Metals & Non-metals (12 Marks)
This chapter alone carries nearly 50% of Chemistry marks.
Revision Tips: Extra focus should be given to reactivity series, extraction of metals, corrosion, properties, and chemical reactions, as both theory and reasoning-based questions are commonly asked.
Section C. Physics Chapter-Wise Weightage (25 Marks)
Physics emphasizes numerical problem-solving, diagrams, laws, and real-life applications. Most questions require step-wise solutions, especially in numericals.
| Physics Chapter | Weightage |
|---|---|
| Electricity | 10 Marks |
| Light – Reflection & Refraction | 8 Marks |
| Human Eye & Colourful World | 4 Marks |
| Magnetic Effects of Electric Current | 3 Marks |
Highest Weightage Physics Chapter: Electricity (10 Marks)
Electricity is the most scoring chapter in Physics if practiced well. Expect numericals + reasoning + circuit-based questions.
Revision Tips: Students must master Ohm’s Law, electric power, resistance combinations, and numericals, as CBSE regularly includes 2–5 mark calculation-based questions from this chapter.
High-Priority Chapters for CBSE Class 10 Science 2026
These chapters must be revised with extra care and concentration:
Biology
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Life Processes (10 marks)
Chemistry
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Metals & Non-metals (12 marks)
Physics
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Electricity (10 marks)
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Light – Reflection & Refraction (8 marks)
Together, these chapters contribute 40+ marks out of 80 — more than 50% of the paper.
Expert Tips to Revise High-Weight Chapters Effectively
1. Biology – Life Processes
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Focus on diagrams (heart, nephron, alveoli)
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Prepare step-wise explanations (digestion, respiration, transport)
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Learn keywords & biological terms used in NCERT
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Practice 2–5 mark application-based questions
Expert Tip: CBSE often twists basic concepts into assertion-reason questions.
2. Chemistry – Metals & Non-metals
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Memorise reactivity series
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Practice extraction of metals with equations
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Understand corrosion, alloys, electrolytic refining
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Learn reasons behind properties, not just facts
Expert Tip: Most students lose marks by writing incomplete chemical equations.
3. Physics – Electricity
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Practice numericals daily
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Learn all formulae derivations
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Master Ohm’s Law, power, series & parallel circuits
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Always write given → formula → substitution → answer
Expert Tip: Step-wise solution fetches full marks even if calculation has minor error.
4. Physics – Light (Reflection & Refraction)
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Practice ray diagrams regularly
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Be clear with sign convention
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Solve numericals from mirror & lens formula
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Revise image formation cases
Expert Tip: Neat ray diagrams can fetch easy 2–3 marks.
| Important Note: CBSE Class 10 Science Board Exam 2026 is of 80 marks, divided into Biology (30), Chemistry (25), and Physics (25). Chapters like Life Processes, Metals & Non-metals, Electricity, and Light carry higher weightage. However, marking schemes may vary slightly in the final board exam, so students should practice all chapters thoroughly for balanced preparation. |
Understanding the CBSE Class 10 Science chapter-wise weightage for Board Exam 2026 helps you study smartly, not blindly. By giving extra attention to Life Processes, Metals & Non-metals, Electricity, and Light, you can significantly boost your final score.
Also Check|
CBSE Class 10 Science Most Repeated Questions PDF
CBSE Class 10 Science Exam Pattern & Question Paper Format 2026
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