CBSE Class 10 Deleted Syllabus 2025-26: Subject-wise List of Removed Topics for Board Exam 2026

Chapter

Topics

REAL NUMBERS

Euclid’s division lemma

Decimal representation of rational numbers in terms of terminating/non-terminating recurring decimals.

POLYNOMIALS

Statement and simple problems on division algorithm for polynomials with real coefficients.

PAIR OF LINEAR EQUATIONS IN TWO VARIABLES

Simple problems on equations reducible to linear equations.

QUADRATIC EQUATIONS

No Deletion

ARITHMETIC PROGRESSIONS

No Deletion

COORDINATE GEOMETRY

Area of a triangle

TRIANGLES

Proofs of the following theorems excluded from syllabus:

• If a perpendicular is drawn from the vertex of the right angle of a right triangle to the hypotenuse, the triangles on each side of the perpendicular are similar to the whole triangle and to each other.
• The ratio of the areas of two similar triangles is equal to the ratio of the squares of their corresponding sides.
• In a right triangle, the square on the hypotenuse is equal to the sum of the squares on the other two sides.
• In a triangle, if the square on one side is equal to sum of the squares on the other two sides, the angles opposite to the first side is a right angle.

CIRCLES

No Deletion

CONSTRUCTIONS

Full Chapter Deleted

INTRODUCTION TO TRIGONOMETRY

No Deletion

TRIGONOMETRIC IDENTITIES

Trigonometric ratios of complementary angles

HEIGHTS AND DISTANCES

No deletion

AREAS RELATED TO CIRCLES

No deletion

SURFACE AREAS AND VOLUMES

Frustum of a cone

Problems involving converting one type of metallic solid into another and other mixed problems. (Problems with combination of not more than two different solids be taken).

STATISTICS

Step deviation Method for finding the mean  

Cumulative Frequency graph

PROBABILITY

No deletion

Chapter 

Page No.

Dropped Topics/Chapters

Chapter 1: Real Number

2–7

15–18

1.2 Euclid’s division lemma

1.5 Revisiting rational numbers and their decimal expansions

Chapter 2: Polynomials

33–37

2.4 Division algorithm for polynomials

Chapter 3:Pair of Linear Equations in Two Variables

39–46

57–69

3.2 Pair of linear equations in two variables

3.3 Graphical method of solution of a pair of linear equations3.

4.3 Cross-multiplication method

3.5 equation reducible to a pair of linear equations in two variables

Chapter 4: Quadratic Equations

76–88

91–92

4.4 Solution of a quadratic equation by completing the squares

Chapter6: Triangles

141–144

144–154

6.5 Areas of similar triangles

6.6 Pythagoras theorem

Chapter7: Coordinate Geometry

168–172

7.4 Area of a triangle

Chapter 8: Introduction to Trigonometry

87–190

193–194

8.4 Trigonometric ratios of complementary  angles

Chapter 9: Some Applications of Trigonometry

195–196

205

9.1 Introduction

Chapter 11: Construction

216–222

11.1 Introduction

11.2 Division of a line segment

11.3 Construction of tangents to a circle

11.4 Summary

Chapter 12: Areas Related to Circles

223

224–226

231–238

12.1 Introduction

12.2 Perimeter and area of acircle- A review

12.4 Areas of combinations of plane figures

Chapter 13: Surface Areas and Volumes

248–252

252–259

13.4 Conversion of solid from one shape to another

13.5 Frustum of a cone

Chapter 14: Statistics

289–294

14.5 Graphical representation of cumulative frequency distribution

Chapter 15: Probability

295–296

311–312

15.1 Introduction Exercise

15.2 (Optional)

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.

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

Chapter

Deleted Topics

All Chapters Retained

No Deletion

Chapter

Deleted Topics

Chapter – Resources and Development

Types of Resources

Chapter – Forest and Wildlife

Biodiversity or Biological Diversity
Flora and Fauna in India
Vanishing Forests
Asiatic Cheetah: Where did they go?
The Himalayan Yew in trouble
Project Tiger

Chapter – Agriculture

Impact of Globalization on Agriculture

Chapter – Manufacturing Industries

Industry Market Linkage
Cotton Textiles, Jute Textiles, Sugar Industry
Iron and Steel Industry, Cement Industry

Chapter

Deleted Topics

All Chapters Retained

No Deletion

Chapter

Deleted Topics

Chapter – Democracy and Diversity

Full Chapter Deleted

Chapter – Gender, Religion and Caste

Images on page 46, 48, 49 of NCERT Textbook – Democratic Politics–II (Reprinted edition 2020–2021)

Chapter – Popular Struggles and Movements

Full Chapter Deleted

Chapter – Challenges to Democracy

Full Chapter Deleted

India and the Contemporary World-II - No Deletion

Contemporary India – II 

Chapter

Page No.

Dropped Topics/Chapters

Chapter 1 - Resources and Development

2–3

11–12

Types of Resources.

Box information

Chapter 2 - Forest and Wildlife

14–18

From second paragraph of ‘Flora and Fauna in India’ to ‘The Himalayan Yew in Trouble’, box information, Figs 2.1 and 2.2

Chapter 4 - Agriculture

43–46

Contribution of agriculture to the national economy, employment and output, Impact of globalisation on agriculture

Chapter 6 -Manufacturing Industries

64–66

68–69

71–73

Contribution of industry to national economy, paragraphs from cotton textiles (India exports... fibre industry), Jute textiles (Challenges... products), Sugar industry (Major... baggase), Iron Steel industry (In 2019... consumer of steel; Though... and discuss), Cement industry (Improvement... industry) and Activity (pg. 72), Table 6.1, Figs 6.1, 6.2 and 6.5

Appendix

93–94

Appendix II

Understanding Economic Development - No Deletion

Democratic Politics – II

Chapter

Page No.

Dropped Topics/Chapters

Chapter 3 - Democracy and Diversity

29–38

Full Chapter

Chapter 4 - Gender, Religion and Caste

46–48

49

Images on page 46, 48 and 49

Chapter 5 - Popular Struggles and Movements

57–70

Full Chapter

Chapter 6: Political Parties

76

Full page

Chapter 8 - Challenges to Democracy

101–112

Full Chapter

Section

Deleted Content

Grammar

Use of passive voice, Noun clauses, Adverb clauses, Relative clauses, Prepositions

First Flight (Prose)

The Hundred Dresses – I, The Hundred Dresses – II

First Flight (Poem)

Animals

Footprints Without Feet (Prose)

The Hack Driver

Words and Expressions – II

Units 5 & 6 Deleted

Class 10 English First Flight Book

Chapter

Page No.

Dropped Topics/Chapter

Chapter 5: The Hundred Dresses I

63–72

Full chapter

Chapter 6: The Hundred Dresses II

73–84

Full chapter

Chapter 6: Poem, Animals

83–85

Full chapter

Class 10 English Footprints without Feet

The Hack Driver

 47–53

Full chapter

Class 10 English Words and Expressions-II

Unit 5

57–70

Full unit

Unit 6

71–83

Full unit

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