📘 CBSE Class 10 Science Syllabus 2025–26
Presented by Anand Classes
The CBSE Class 10 Science Syllabus for 2025-26 has been officially released. Students preparing for the upcoming board examinations must carefully go through the updated syllabus. At Anand Classes, we provide a structured overview to help students understand the key topics, chapter-wise distribution, and internal assessment criteria.
This syllabus lays a strong foundation for future academic pursuits in Science (PCM/PCB streams) and covers three main disciplines:
✅ Physics
✅ Chemistry
✅ Biology
📊 CBSE Class 10 Science 2025-26 – Units & Marks Distribution
| Unit No. | Unit Name | Marks |
|---|---|---|
| 1 | Chemical Substances – Nature and Behaviour | 25 |
| 2 | World of Living | 25 |
| 3 | Natural Phenomena | 12 |
| 4 | Effects of Current | 13 |
| 5 | Natural Resources | 05 |
| Internal Assessment | 20 | |
| Total | 100 |
📥 Download Class 10 Science Study Material (PDF)
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Biology Class 10 : Chapters and Their Detailed Content
Physics Class 10 : Chapters and Their Detailed Content
Chemistry Class 10 : Chapters and Their Detailed Content
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📘 Unit-Wise Chapter Breakdown (With Topics)
Let’s explore each chapter in detail along with its sub-topics:
🔬 UNIT 1: Chemical Substances – Nature and Behaviour (25 Marks)
📖 Chapter 1: Chemical Reactions and Equations
- 1.1 Chemical Equation
- 1.2 Balanced Chemical Equation
- 1.3 Implications of a Balanced Equation
- 1.4 Types of Chemical Reactions
📖 Chapter 2: Acids, Bases, and Salts
- 2.1 Definition (H⁺ and OH⁻ Ions)
- 2.2 Properties of Acids and Bases
- 2.3 Uses and Examples
- 2.4 pH Scale
- 2.5 Sodium Hydroxide Properties and Uses
📖 Chapter 3: Metals and Non-metals
- 3.1 Physical & Chemical Properties
- 3.2 Reactivity Series
- 3.3 Ionic Compounds
- 3.4 Metallurgical Processes
- 3.5 Corrosion and Prevention
📖 Chapter 4: Carbon and Its Compounds
- 4.1 Covalent Bonding
- 4.2 Versatile Nature of Carbon
- 4.3 Nomenclature
- 4.4 Saturated vs Unsaturated Hydrocarbons
- 4.5 Ethanol and Ethanoic Acid
🌱 UNIT 2: World of Living (25 Marks)
📖 Chapter 5: Life Processes
- 5.1 Nutrition in Plants and Animals
- 5.2 Respiration
- 5.3 Transportation of Materials
- 5.4 Excretion
📖 Chapter 6: Control and Coordination
- 6.1 Tropic Movements in Plants
- 6.2 Nervous System in Humans
- 6.3 Reflex Actions
- 6.4 Plant Hormones
- 6.5 Animal Hormones
📖 Chapter 7: How Do Organisms Reproduce?
- 7.1 Asexual and Sexual Reproduction
- 7.2 Reproductive Health
- 7.3 HIV/AIDS Awareness
- 7.4 Childbearing and Women’s Health
📖 Chapter 8: Heredity and Evolution
- 8.1 Mendelian Genetics
- 8.2 Sex Determination
- 8.3 Evolution Basics
🔭 UNIT 3: Natural Phenomena (12 Marks)
📖 Chapter 9: Light – Reflection and Refraction
- 9.1 Reflection at Curved Surfaces
- 9.2 Refraction Through Glass and Water
📖 Chapter 10: The Human Eye and the Colourful World
- 10.1 Eye Structure and Function
- 10.2 Defects and Correction
- 10.3 Dispersion and Scattering of Light
- 10.4 Atmospheric Refraction
⚡ UNIT 4: Effects of Current (13 Marks)
📖 Chapter 11: Electricity
- 11.1 Potential Difference and Current
- 11.2 Ohm’s Law
- 11.3 Resistance & Resistivity
- 11.4 Series & Parallel Combinations
- 11.5 Heating Effects
- 11.6 Electric Power
📖 Chapter 12: Magnetic Effects of Electric Current
- 12.1 Magnetic Field
- 12.2 Fleming’s Rules
- 12.3 Electromagnetic Induction
- 12.4 Domestic Circuits
🌍 UNIT 5: Natural Resources (05 Marks)
📖 Chapter 13: Our Environment
- 13.1 Ecosystems
- 13.2 Environmental Issues
- 13.3 Waste Management
- 13.4 Ozone Layer and Depletion
- 13.5 Biodegradable & Non-biodegradable Substances
📝 Question Paper Design – Science (80 Marks)
| Typology of Questions | Very Short Answer (1 mark) | Short Answer-I (2 marks) | Short Answer-II (3 marks) | Long Answer (5 marks) | Total Marks |
|---|---|---|---|---|---|
| Remembering (Knowledge-based) | 2 | 1 | 1 | 1 | 12 |
| Understanding (Comprehension) | 2 | 2 | 1 | 1 | 15 |
| Application (Using concepts) | 1 | 2 | 2 | 1 | 17 |
| Analyzing, Evaluating, and Creating | 1 | 2 | 2 | 1 | 18 |
| Case-based / Source-based Questions | 2 (4 marks each) | – | – | – | 8 |
| Total | 8 × 1 = 8 marks | 7 × 2 = 14 marks | 6 × 3 = 18 marks | 3 × 5 = 15 marks | 80 Marks |
📘 Weightage of Units (CBSE Class 10 Science Example)
| Unit | Marks |
|---|---|
| Chemical Substances – Nature and Behaviour | 25 |
| World of Living | 23 |
| Natural Phenomena | 12 |
| Effects of Current | 13 |
| Natural Resources | 7 |
| Total | 80 |
🧮 General Instructions
- Total Questions: Approx. 30
- Time Allowed: 3 Hours
- Internal Choice: Provided in selected questions
- Question Format: Mix of theory, numericals, and practical application
🧪 Internal Assessment (20 Marks)
This component includes:
- Periodic Tests
- Practical Work (Lab Experiments)
- Portfolio Submission (Project Work, Reports)
- Student Enrichment Activities
👉 Tip: Actively participate in practicals and maintain neat, organized lab records for scoring full marks here.
📘 FAQs – CBSE Class 10 Science Syllabus 2025–26
❓ Q1. What are the main units covered in the Class 10 Science syllabus for 2025–26?
Ans: The CBSE Class 10 Science syllabus for 2025–26 covers the following five broad units:
- Chemical Substances – Nature and Behaviour
- World of Living
- Natural Phenomena
- Effects of Current
- Natural Resources
❓ Q2. Is there any change in the syllabus for the 2025–26 academic session?
Ans: As per the latest CBSE circular, the 2025–26 syllabus has undergone minor rationalization, mainly to reduce redundancy and improve concept clarity. Topics not relevant to current academic outcomes may have been removed or merged.
❓ Q3. How many marks are allotted for internal assessment in Science?
Ans: Internal Assessment carries 20 Marks, divided as follows:
- Periodic Tests – 10 Marks
- Practical/Experiments (Lab Work) – 5 Marks
- Portfolio (Student’s Work/Assignments) – 5 Marks
❓ Q4. What is the total marks distribution in the Class 10 Science exam?
Ans: The Science exam is divided into:
- Theory Paper – 80 Marks
- Internal Assessment – 20 Marks
- Total – 100 Marks
❓ Q5. What types of questions can be expected in the CBSE Science exam?
Ans: The question paper includes:
- Very Short Answer Questions (1 mark)
- Short Answer Questions – I & II (2 and 3 marks)
- Long Answer Questions (5 marks)
- Case-Based Questions
All questions test conceptual understanding, application, and critical thinking.
📌 Final Thoughts by Anand Classes
The CBSE Class 10 Science syllabus is well-structured and designed to help students not only perform in the board exam but also prepare for competitive exams like NTSE, JEE, and NEET Foundation. Students are advised to study each chapter thoroughly and practice concept-based questions regularly.
Stay tuned with Anand Classes for:
✅ Chapter-wise Notes
✅ Practice Questions
✅ NCERT Solutions
✅ Test Papers with Marking Scheme
✅ Online Video Lectures and PDFs
