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23-08-2025
The Central Board of Secondary Education (CBSE) has revised the Class 10 Science syllabus for the 2025 board exams. Some chapters and topics have been completely removed, while others have been trimmed down. These changes will help reduce the academic burden on students and make the learning process more focused and meaningful. If you are preparing for the upcoming Class 10 Science exam, it’s important to know the deleted topics so you don’t waste time studying content that will not be included in the exam.
CBSE has rationalized the syllabus with the following objectives:
To check the list of deleted topics from CBSE Class 10 Science for the 2025 board exam, you can refer to the table provided below. The chapter names are mentioned on the left, with the deleted topics on the right side of the table. Students of the 2024–25 academic year must check this table while preparing for the exams.
| 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. |
After the deletion of the CBSE 10th Science syllabus, the NCERT has also revised its science textbook. Certain topics and even chapters along with exercise questions and activities have been removed. Students following the old NCERT textbook for Class 10 Science must check and mark these topics as red to indicate their deletion or removal from the latest syllabus.
| Chapter Name | Page No. | Dropped Topics/Chapter |
| 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 |
Knowing the deleted topics gives students a big advantage:
Check:CBSE Class 10 Science Standard Question Paper Design
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