The CBSE Class 10 science deleted syllabus 2025-26 contains deleted topics from chapters such as sources of energy, management of natural resources, and more. Students should check all the chapters and exercises that are no longer part of the updated CBSE 10th syllabus and prepare accordingly.
The Central Board of Secondary Education (CBSE) has updated the CBSE 10th science syllabus. The CBSE has been constantly revising the CBSE syllabus for various classes to enhance the holistic development of students. The CBSE Class 10 Science deleted syllabus 2025-26 is also available on the official website at cbseacademic.nic.in.
The deleted portions in the updated CBSE class 10 science deleted syllabus 2026 are periodic classification, sources of energy, management of natural resources, and more. The Board has removed portions from six chapters in the deleted syllabus of class 10 CBSE 2025-26 science. A total of 30% of the previous syllabus has been removed.
The CBSE class 10 Board exam 2026 will be conducted from February 17 to March 10, 2026. This article covers everything students need to know about the CBSE class 10 science updated syllabus 2026, as it will help students score better marks in the CBSE class 10 exams 2026.
CBSE Class 10 Science Deleted Syllabus 2025-26
Several chapters have been removed from the CBSE class 10 syllabus 2026 for Science, while sub-topics have been removed from a few parts of the CBSE 10th Science deleted syllabus 2025-26. The Board will not further consider answers for assessment from the science deleted syllabus class 10 CBSE 2025-26. Additionally, class 10 students can check the chapter names and subtopics, which are part of the class 10 science deleted syllabus 2025-26.
| Chapter Name | Topics Deleted |
| Periodic Classification (Full Chapter Deleted) | Need for classification, early attempts at classification of elements (Dobereiner’s Triads, Newland’s Law of Octaves, Mendeleev’s Periodic Table), Modern periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties. |
| Heredity and Evolution | Basic concepts of evolution: evolution; evolution and classification and evolution should not be equated with progress |
| The Human Eye and the Colourful World | Application of scattering in explaining colour change of the sun at sunrise and sunset |
| Magnetic Effects of Current | Electric Motor, Electromagnetic induction. Induced potential difference, Induced current. Fleming’s Right Hand Rule, Electric Generator, |
| Sources of Energy (Full Chapter Deleted) | Different forms of energy, conventional and non-conventional sources of energy: Fossil fuels, solar energy; biogas; wind, water and tidal energy; Nuclear energy. Renewable versus non-renewable sources of Energy. |
| Management of Natural Resources (This chapter will not be assessed in the year-end examination. It needs to be prepared only for Internal Assessment.) | Conservation and judicious use of natural resources. Forest and wild life; Coal and Petroleum conservation. Examples of people’s participation for conservation of natural resources. Big dams: advantages and limitations; alternatives, if any. Water harvesting. Sustainability of natural resources. |
Also Read: CBSE Class 10 Question Bank
NCERT Class 10 Science Deleted Syllabus 2025-26
After the CBSE revised the CBSE class 10th science syllabus, NCERT also updated the official NCERT class 10th science textbook. Students who follow the CBSE class 10 Science syllabus must note that the following portions have been removed from the textbook.
| Chapter | Page Numbers | Eliminated Portions |
| Chapter 5: Periodic Classification of Elements | 79–92 | Full chapter |
| Chapter: 9 Heredity and Evolution (Chapter name replaced with: Heredity) | 147-158 | Box item: Charles Robert Darwin Box item: Origin of life on Earth Box item: How do fossils form layer by layer Box item: Molecular phylogeny 9.3 Evolution 9.3.1 An Illustration 9.3.2 Acquired and Inherited Traits 9.4 Speciation 9.5 Evolution and Classification 9.5.1 Tracing Evolutionary Relationships 9.5.2 Fossils 9.5.3 Evolution by Stages 9.6 Evolution Should Not Be Equated With ‘Progress’ 9.6.1 Human Evolution |
| Chapter: 11 The Human Eye and the Colourful World | 188, 189, 196 and 197 | Two box items: • Damage to or malfunction of any part of the visual system... • Why do we have two eyes for vision and not just one? 10.6.3 Colour of the Sun at Sunrise and Sunset |
| Chapter: 12 Electricity | 201 | Box item: ‘Flow’ of charges inside a wire |
| Chapter: 13 Magnetic Effects of Electric Current | 232–237 | Box item: Michael Faraday 3.4 Electric Motor 3.5 Electromagnetic Induction 3.6 Electric Generator |
| Chapter: 14 Sources of Energy | 242–255 | Full chapter |
| Chapter: 16 Sustainable Management of Natural Resources | 266–280 | Full chapter |
CBSE Class 10 Science Syllabus 2025-26
The latest CBSE class 10 exam syllabus 2026 for Science is provided below with unit-wise marks assignment. A total of 5 units is allotted for the CBSE Class 10 Science 2026 syllabus.
| Unit No. | Chapters | Topics | Marks |
| 1 | Chemical Substances - Nature and Behaviour | Chemical reactions and equations, | 25 |
| Acids, Bases, and Salts | |||
| Carbon compounds | |||
| 2 | World of Living | Life processes | 25 |
| Control and coordination in animals and plants | |||
| Reproduction | |||
| Heredity and Evolution | |||
| 3 | Natural Phenomena | Reflection of light by curved surfaces | 12 |
| Refraction of light by a spherical lens | |||
| Functioning of a lens in the human eye | |||
| Refraction of light through a prism | |||
| 4 | Effects of Current | Electric current | 13 |
| potential difference and electric current | |||
| Ohm’s law | |||
| Magnetic effects of current | |||
| 5 | Natural Resources | Our environment | 05 |
| Total | 80 | ||
CBSE Class 10 Science Exam 2026 Chapter-wise Marking Scheme
According to the CBSE class 10 Science exam pattern 2026, marks for each question range between 1 and 5. The table below shows the marking scheme of questions for each chapter in the CBSE 10th Science exam 2026.
| Chapter Name | 1-Mark | 2-Marks | 3-Marks | 4-Marks | 5-Marks | Total |
|---|---|---|---|---|---|---|
| Chemical Reactions and Equations | 3 | - | 1 | - | - | 6 |
| Acids, Bases, and Salts | 3 | - | - | - | - | 3 |
| Metals and Non-metals | 1 | 1 | 1 | 1 | - | 10 |
| Carbon and Its Compounds | 1 | - | - | - | 1 | 6 |
| Periodic Classification of Elements | Deleted | |||||
| Life Processes | 2 | 2 | 1 | - | - | 9 |
| Control and Coordination | 1 | 1 | - | - | - | 3 |
| How do Organisms Reproduce? | 1 | - | - | - | 1 | 6 |
| Heredity and Evolution | 3 | - | - | 1 | - | 7 |
| Light – Reflection and Refraction | - | - | 2 | 1 | - | 10 |
| The Human Eye and the Colourful World | - | 1 | - | - | - | 2 |
| Electricity | 2 | - | - | - | 1 | 7 |
| Magnetic Effects of Electric Current | 3 | - | 1 | - | - | 6 |
| Our Environment | - | 1 | 1 | - | - | 5 |
| Total | 20 | 6 | 7 | 4 | 4 | 80 |
CBSE Class 10th Science Syllabus 2025-26
Students must take note of the CBSE class 10 Science syllabus for the academic year, which is available in the PDF below. All details, such as chapter name, marks total weightage, practical work instructions, and question paper evaluation guidelines, are mentioned in the updated syllabus for class 10 Science 2025-26.
| Particulars | |
| CBSE Class 10 Science Syllabus 2025-26 PDF | Click Here |
Also Read: CBSE Class 10th Blueprint 2026
CBSE Class 10 Science Question Pattern 2026
According to the CBSE class 10 exam pattern 2026, the exam for Science will contain MCQs, short-answer type, long-answer type and competency-based questions worth 80 Marks. The question pattern for the CBSE 10th Science exam 2026 is given below.
| Sections | Question Types | Marks For Each Question | Number of Questions | Marks |
|---|---|---|---|---|
| Section A | MCQ | 1 | 20 | 20 |
| Section B | Short Answer Type – I | 2 | 6 | 12 |
| Section C | Short Answer Type – II | 3 | 7 | 21 |
| Section D | Long Answer Type | 5 | 3 | 15 |
| Section E | Competency-Based | 4 | 3 | 12 |
| Total | 39 | 80 | ||
CBSE Class 10 Science Previous Year Question Papers
The CBSE 10th Previous Year Question Papers for Science are provided in the following table. Students can refer to the previous years' question papers while studying for the exam, which will help them with CBSE class 10 exam preparation by understanding the question pattern and marking scheme in the previous academic years' board exams.
| Years | Previous Years' Question Papers PDF |
|---|---|
| 2026 | Download Now |
| 2024 | Download Now |
| 2023 | Download Now |
| 2022 | Download Now |
| 2021 | Download Now |
Reasons Behind Class 10 Science Deleted Syllabus 2025-26
Since science is a subject that helps students develop their cognitive abilities and affective and psychometric skills, the board has designed the syllabus that promotes these qualities and allows students to exhibit them. Certain factors have been considered while constructing the CBSE class 10 science deleted syllabus 2025-26.
- First and foremost, the rationalization through the deleted syllabus of science class 10 CBSE 2025-26 aims to re-assess the difficulty level of the paper.
- Authorities wish to facilitate a self-learning environment where students don’t have to seek external help from tutors and peers, which they had to when the science class 10 deleted syllabus 2025-26 was still in the curriculum.
- The Class 10 Science Deleted Syllabus 2025-26 contains topics that are irrelevant to the scenario today.
- The CBSE Board wants to concentrate the updated syllabus on broader themes.
Also Read: New Guidelines for CBSE Class 10 Students 2025-26
Benefits of the CBSE Class 10 Science Deleted Syllabus 2025-26
With the eliminations through the CBSE Class 10th Science Deleted Syllabus 2025-26 of chapters such as Management of Natural Resources and Periodic Classification, students will notice that the restructuring benefits them in more than a few ways.
- The updated class 10 science syllabus 2025-26 is structured flexibly, which promotes easier learning, as concepts are more straightforward and easily understood.
- With broader concept-based chapters in the Science syllabus, the foundation of core subjects such as Physics, Chemistry, and Biology is more substantial than before, which will help them score better in classes 11 and 12.
- Students will notice that their productivity, too, has improved as the focus has shifted from non-essential topics to the most vital chapters.
CBSE Class 10 Science Syllabus 2025-26 Design
The CBSE class 10 science deleted syllabus 2025-26 has been designed for students taking the 80-mark theory paper and 20-mark practical exam. The core competencies on which the syllabus is created and their weightage are mentioned below.
- Demonstrate Knowledge and Understanding - The syllabus is built for students to state, name, list, identify, define, and outline topics. They need to be able to summarise all they have learned, as there is a critical 46% weightage.
- Application of Knowledge and Concepts - With the study of the syllabus, students must be capable of calculating and distinguishing the subjects taught, as it holds 22% weight.
- Formulate, Analyse, Evaluate, and Create - Further, through the new CBSE class 10 science syllabus 2025-26, students must be able to examine and discuss their learnings in real-time.
Therefore, practical exams are equally important for students, as 32% of the weight is given to this qualification.
Also Read: CBSE Class 10th Best Reference Books
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