# Deleted Topics for CBSE Class IX

Deleted portion of curriculum for CBSE class IX in English, Mathematics, Science, Social Science, and Computer Application.

### English - Language and Literature

**Grammar**

- Use of Passive Voice
- Clauses: Noun, Adverb Clauses of condition and time, Relative
- Prepositions

**Writing**

- Letter on a situation
- Descriptive Paragraph on a place/event

**Literature**

**BEEHIVE**

- The Lake Isle of Innisfree
- The Snake & The Mirror
- The Duck & The Kangaroo
- Kathmandu
- A Slumber Did My Spirit Seal

**MOMENTS**

- Ishwaran the Storyteller
- The Accidental Tourist

### Mathematics

**UNIT I - NUMBER SYSTEMS**

REAL NUMBERS

- Representation of terminating / non-terminating recurring decimals on the number line through successive magnification.
- Explaining that every real number is represented by a unique point on the number line and conversely, viz. every point on the number line represents a unique real number.
- Definition of nth root of a real number.

**UNIT II - ALGEBRA**

POLYNOMIALS

- Motivate and State the Remainder Theorem with examples. Statement and proof of the Factor Theorem.
- x3 + y3 + z3 - 3xyz

LINEAR EQUATIONS IN TWO VARIABLES

- Examples, problems on Ratio and Proportion

**UNIT III - COORDINATE GEOMETRY**

COORDINATE GEOMETRY

- No deletion

**UNIT IV - GEOMETRY**

INTRODUCTION TO EUCLID'S GEOMETRY

- Delete the Chapter

LINES AND ANGLES

- No deletion

TRIANGLES

- Proof of the theorem deleted - Two triangles are congruent if any two angles and the included side of one triangle is equal to any two angles and the included side of the other triangle (ASA Congruence).
- Topic Deleted - Triangle inequalities and relation between ‘angle and facing side' inequalities in triangles.

QUADRILATERALS

- No deletion

AREA

- Delete the Chapter

CIRCLES

- There is one and only one circle passing through three given non-collinear points.
- If a line segment joining two points subtends equal angle at two other points lying on the same side of the line containing the segment, the four points lie on a circle.

CONSTRUCTIONS

- Construction of a triangle of given perimeter and base angles

**UNIT V - MENSURATION**

AREAS

- Application of Heron’s Formula in finding the area of a quadrilateral.

SURFACE AREAS AND VOLUMES

- No deletion

**UNIT VI - STATISTICS & PROBABILITY**

STATISTICS

- Histograms (with varying base lengths)
- Frequency polygons.
- Mean, median and mode of ungrouped data.

PROBABILITY

- No deletion

### Science

**Unit I: Matter-Nature and Behaviour**

**Matter in Our Surroundings:**Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.

**Unit II: Organization in the Living World**

**Diversity in Living Organisms:**Diversity of plants and animals-basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes).

**Unit III: Motion, Force and Work**

**Floatation:**Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of Relative Density.**Sound:**Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the Human Ear (Auditory aspect only).

**Under Unit V: Food Production**

**Improvement in Food Resources:**Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

### Social Science

**UNIT 1: INDIA AND THE CONTEMPORARY WORLD - I (HISTORY)**

**Section 2:**Livelihoods, Economies and Societies - Complete Section (Both the Chapters)

Any one out of these two chapters

**Chapter IV:**Forest Society and Colonialism**Chapter V:**Pastoralists in the Modern World

**UNIT 2: CONTEMPORARY INDIA - 1 (GEOGRAPHY)**

**Chapter 3:**Drainage - Complete Chapter except for Map Items which will be assessed in the Examination**Chapter 6:**Population - Complete Chapter

**UNIT 3: DEMOCRATIC POLITICS - I (POLITICAL SCIENCE)**

**Chapter 2:**Constitutional Design - Democratic Constitution in South Africa (Only)**Chapter 5:**Democratic Rights - Complete Chapter

**UNIT 4: ECONOMICS**

**Chapter 4:**Food Security in India - Complete Chapter

### Computer Application

**Unit 4: Scratch or Python**

Alternative 1: Educational programming language - Scratch

- Introduction to Scratch.
- Drag and drop commands, creating simple scripts, repeating blocks of commands.
- Discuss x-y plane, create scripts to move the cat (Scratch mascot).
- Create a script to draw diagrams using the pen feature.

Alternative 2: Python

- Programming Basics: Algorithms and Flowcharts
- Characteristics of a good program
- Introduction to Python
- A simple "Hello World" program
- Running a Python program