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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9
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Syllabus

Science SSLC (English Medium) Class 9 Tamil Nadu Board of Secondary Education Syllabus 2025-26

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Tamil Nadu Board of Secondary Education Class 9 Science Syllabus - Free PDF Download

Tamil Nadu Board of Secondary Education Syllabus 2025-26 Class 9: The Tamil Nadu Board of Secondary Education Class 9 Science Syllabus for the examination year 2025-26 has been released by the Tamil Nadu Board, Tamil Nadu Board of Secondary Education. The board will hold the final examination at the end of the year following the annual assessment scheme, which has led to the release of the syllabus. The 2025-26 Tamil Nadu Board of Secondary Education Class 9 Science Board Exam will entirely be based on the most recent syllabus. Therefore, students must thoroughly understand the new Tamil Nadu Board of Secondary Education syllabus to prepare for their annual exam properly.

The detailed Tamil Nadu Board of Secondary Education Class 9 Science Syllabus for 2025-26 is below.

Academic year:

Tamil Nadu Board of Secondary Education Class 9 Science Revised Syllabus

Tamil Nadu Board of Secondary Education Class 9 Science Course Structure 2025-26 With Marking Scheme

#Unit/TopicWeightage
1  Measurement 
2  Motion 
3  Fluids 
4  Electric Charge and Electric Current 
5  Magnetism and Electromagnetism 
6  Light 
7  Heat 
8  Sound 
9  Universe 
10  Matter Around Us 
11  Atomic Structure 
12  Periodic Classification of Elements 
13  Chemical Bonding 
14  Acids, Bases and Salts 
15  Carbon and Its Compounds 
16  Applied Chemistry 
17  Animal Kingdom 
18  Organisation of Tissues 
19  Plant Physiology 
20  Organ Systems in Animals 
21  Nutrition and Health 
22  World of Microbes 
23  Economic Biology 
24  Environmental Science 
25  Computer – LibreOffice Impress 
 Total -
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Syllabus

1 Measurement
  • Measurements  
    • Measurement
    • The need for measurement in daily life
  • Physical Quantities  
    • Introduction
    • Types of Physical Quantities
  • Unit and Its Types  
    • Units
    • Types of units : Fundamental and Derived units
  • Unit Systems  
    • Introduction
    • Types of Unit System
  • Properties of Matter and Their Measurement  
  • Measurement of Length  
    • Length and Its Measurement  
    • The Parallax Method
    • Activity: Understanding Parallax Through Experience
    • Measuring Stellar Distances
    • Measuring the Size od Celestial Objects
    • Measuring Very Small Distances
    • Special Units for Large Distances
    • Example
  • Measuring Smaller Distances  
    • Fermi (f)
    • Angstrom (A°)
    • Nanometre (nm)
    • Micron (micrometre μm)
    • Millimetre (mm)
    • Centimetre (cm)
  • Measuring Larger Distances  
    • Astronomical unit
    • Light year
    • Parsec
  • Measurement of Mass  
    • Introduction
    • The Old Kilogram Standard
    • The New Kilogram Standard
    • Measuring Atoms & Molecules: Atomic Mass Unit (amu)
  • Measurement of Time  
    • The Foundation of Time
    • The Revolutionary Solution: Cesium Atomic Clocks
    • Real World Applications
  • The Temperature and a Thermometer  
    • Introduction
    • Unit of Temperature
    • Experiment: 1
    • Experiment: 2
  • Scales of Thermometers  
    1. Fahrenheit scale
    2. Celsius temperature scale
    3. Kelvin scale (Absolute scale)
    • Relationship between the three scales of temperature
    • Conversion of Temperature from celsius scale to kelvin scale and vice-versa
  • Unit Prefixes  
  • System of Units  
  • Vernier Callipers  
  • Screw Gauge  
  • Devices for Measuring Mass  
  • Mass and Weight  
    • Definition: Mass
    • Definition: Weight
  • Accuracy in Measurements  
2 Motion
3 Fluids
  • Thrust and Pressure  
    • Introduction
    • Unit of pressure
    • Experiment
  • Pressure of liquid  
    • Introduction
    • Experiment 1
    • Experiment 2
  • Factors Affecting Liquid Pressure  
  • Pressure Exerted by a Liquid Column  
  • Atmospheric Pressure  
  • Measurement of Atmospheric Pressure  
    • Mercury Barometer (Simple Barometer)  
  • Gauge Pressure and Absolute Pressure  
  • Pascal’s Law  
  • Hydraulic Machines: Hydraulic Press (Or Bramah Press)  
  • Density and It’s Unit  
    • Density
    • Unit of Density
    • Relationship between S.I. and C.G.S. units
  • Relative Density and Its Unit  
    • Relative density
    • Unit of relative density
  • Principle of Floatation (Laws of Flotation)  
  • Application of Principle of Flotation  
  • Buoyancy Force (Upthrust Force)  
    • Introduction
    • Experiment 1
    • Experiment 2
  • Archimedes Principle  
    • Introduction
    • Discovery of Archimedes Principle
    • Archimedes Principle
    • Experiment
  • Law of Floatation  
4 Electric Charge and Electric Current
5 Magnetism and Electromagnetism
  • Magnet  
  • Classification of Magnets  
    • Classification of Magnets
      1) Natural Magnet
      2) Artificial Magnet
  • Magnetic Field  
    • Introduction
    • Definition: Magnetic Field
    • Experiment
  • Properties of magnetic lines of force  
  • Magnetic Effect of Electric Current  
    • Key Points: Magnetic Effect of Electric Current
  • Force on a Current Carrying Conductor in a Magnetic Field  
    • Key Points: Force on a Current Carrying Conductor in a Magnetic Field
  • Force on Parallel Current Carrying Conductors  
  • Electric Motor  
    • Definition: Electric Motor
  • Electromagnetic Induction  
    • Definition: Electromagnetic Induction
  • Faraday's Laws of Electromagnetic Induction  
    • Definition: Faraday's Law of Induction
    • Law: Faraday's First Law or Neumann's Law
    • Law: Faraday's Second Law or Lenz's Law
  • A.C. Generator  
    • Principle
    • Construction and Its Main Parts
    • Working
    • Frequency of Altering Current
  • Simple D.C. Motor  
    • Principle
    • Construction and Its Main Parts
    • Working
    • Ways of Increasing the Speed of Rotation of the Coil
    • Function of Split Ring Commutator
  • Comparison Between A.C. Generator and D.C. Motor  
    • Table
    • Similarities between an A.C. Generator and a D.C. Motor
  • Electric Generator  
    • Key Points: Electric Generator
  • Transformers  
    • Introduction
    • Principle
    • Construction
    • Theory
    • Energy Losses in a Transformer
    • Utility of Transformers in Long-distance Power Transmission
    • Types of Transformer
    • Examples
    • Uses of Transformers
    • Table
  • Types of Transformer  
    • Types of Transformer
    1. Step up transformer
    2. Step down transformer
    • Distinction between the step up and step down transformers
    • Examples of Step up transformer and Step down transformer
    • Uses of Step up transformer and Step down transformer
  • Uses of Electromagnet  
    • Common Uses of Electromagnets
    • Use of an Electromagnet in an Electric bell
    • Working and Function of Each Part
6 Light
7 Heat
  • Heat  
    • Introduction
    • Units of Heat
  • Effects of Heat  
  • Transfer of Heat  
  • Conduction  
    •  Definition: Conduction
    • Experiment
    • Mechanism of Conduction
    • Good conductors 
    • Bad conductors
  • Convection  
    • Convection: Convection currents
    • Experiment
    • Mechanism of Convection
    • Definition: Convection 
    • Definition: Convection currents 
  • Environmental Issues  
  • The Temperature and a Thermometer  
    • Introduction
    • Unit of Temperature
    • Experiment: 1
    • Experiment: 2
  • Scales of Thermometers  
    1. Fahrenheit scale
    2. Celsius temperature scale
    3. Kelvin scale (Absolute scale)
    • Relationship between the three scales of temperature
    • Conversion of Temperature from celsius scale to kelvin scale and vice-versa
  • Absolute Zero and Absolute Temperature  
    • Gas Behaviour and Temperature
    • Kelvin Scale (Absolute Scale)
    • Triple Point of Water
    • Example 1
    • Example 2 
  • Specific Heat Capacity  
    • Definition: Specific Heat Capacity
    • Formula: Specific Heat Capacity
    • Key Points: Specific Heat Capacity
    • Thermal Capacity  
      • Introduction
      • Definition: Thermal Capacity
      • Formula: Thermal Capacity
      • Units of Heat Capacity
      • Equation Derivation
      • Example  
  • Change of State  
    • Introduction
    • Definition: Change of State
    • Freezing
    • Condensation
    • Activity 
    • Concept of Melting (Fusion)  
      • Melting (Fusion)
      • Melting point
      • Latent heat
      • Latent heat of fusion
      • Heating curve of ice during melting
      • Change in volume on melting
      • Effect of pressure on the melting point
      • Effect of impurities on the melting point
    • Concept of Condensation (Liquefaction)  
    • Concept of Desublimation (Deposition)  
  • Vaporisation or Boiling  
    • Definition: Vaporisation
    • Definition: Boiling Point
    • Example
    • Changes in States of Water
    • Experiment: Heating Curve for Water
  • Sublimation  
    • Introduction
    • Experiment
  • Latent Heat  
    • Definition: Latent Heat
    • Definition: Specific Latent Heat
    • Definition: Latent Heat of Fusion
    • Definition: Specific Latent Heat of Fusion
    • Definition: Specific Latent Heat of Vapourisation
    • Definition: Melting Point of Ice
    • Definition: Boiling Point of the Liquid
    • Formula: Specific Latent Heat
8 Sound
9 Universe
10 Matter Around Us
11 Atomic Structure
12 Periodic Classification of Elements
13 Chemical Bonding
  • Concept of Chemical Bonding  
    • Definition: Chemical Bond
  • Ionic or Electrovalent Bond  
    • Definition: Ion
    • Definition: Cation
    • Definition: Anion
    • Definition: Electropositive Element
    • Definition: Electronegative Element
    • Definition: Electrovalent Bond
    • Definition: Electrovalent (or Ionic) Compounds
    • Definition: Electrovalency
  • The Covalent Bond  
    • Definition: Covalent Compound
    • Definition: Covalent Molecule
    • Key Points: The Covalent Bond
  • Formation of Covalent Bond  
    • Key Points: Formation of Covalent Bond
  • Fajan’s Rule  
  • Coordinate Bond  
    • Definition: Coordinate Bond
    • Definition: Lone Pair
  • Formation of Coordinate Bond  
    • Conditions for the formation of coordinate bond
    • Formation of coordinate bond
    1. Formation of H3O+ ion and lone pair effect of oxygen atom
    2. Formation of Ammonium ion (NH4+) and Lone Pair Effect of Nitrogen Atom
    3. Formation of hydroxyl ion (OH-)
  • Chemical Properties of Carbon Compounds > Oxidation  
    • Definition: Oxidation Reaction
    • Definition: Oxidants or Oxidising Agents
    • Key Points: Oxidation
14 Acids, Bases and Salts
15 Carbon and Its Compounds
  • Carbon: A Versatile Element  
    • Definition: Tetravalency of Carbon
    • Definition: Catenation
    • Key Points: Carbon-A Versatile Element
  • Discovery of Carbon Milestones  
  • Classification of Compounds of Carbon  
    • Organic Compounds of Carbon
    • Inorganic Compounds of Carbon
    • Comparison between organic and inorganic compounds
  • Special Features of Carbon  
    • Catenation
    • Tetravalency
    • Multiple Bonds
    • Isomerism
    • Allotropy
    1. Crystalline forms of Carbon
    2. Non-crystalline / Amorphous forms
  • Allotropes of Carbon > Diamond  
    • Crystalline Forms
    • Diamond
    • Uses of Diamond
  • Allotropes of Carbon > Graphite  
    • Graphite
    • Experiment
    • Uses of Graphite
  • Allotropes of Carbon > Fullerene  
    • Fullerene
    • Uses of Fullerene
  • Straight chains, Branched chains, and Rings of Carbon atoms  
    • Definition: Aromatic Compounds
    • Key Points: Straight Chains, Branched Chains, and Rings of Carbon Atoms
  • Bonds in Carbon Compounds  
    • Definition: Organic Compounds
    • Definition: Covalent Bond
    • Key Points: Bonds in Carbon Compounds
  • Man-made Fibre: Plastics  
    • Materials
    • Plastic: A Manmade Material
    • Properties of Plastic
  • Identifying Different Types of Plastics: Resin Codes  
  • Harmful Effects of Plastics  
  • New Rules to Make Tamil Nadu Plastic Free  
  • Role of Students in the Prevention of Plastic Pollution  
16 Applied Chemistry
  • Applied Chemistry  
  • Nanochemistry  
  • Pharmaceutical Chemistry  
  • Anaesthetics  
  • Antacid  
  • Antibiotics  
    • Definition: Antibiotics
  • Analgesics  
  • Antipyretic  
  • Antiseptics and Disinfectants  
    • Antiseptics
    • Disinfectants
    • Differences between antiseptics and disinfectants
  • Antimalarial  
  • Electrochemistry  
  • Electro Chemical Cells  
  • Radiochemistry  
  • Dye Chemistry  
  • Agricultural Chemistry  
  • Food Chemistry  
  • Forensic Chemistry  
17 Animal Kingdom
18 Organisation of Tissues
19 Plant Physiology
20 Organ Systems in Animals
21 Nutrition and Health
22 World of Microbes
  • Bacteria  
  • Viruses  
  • Fungi  
  • Prions  
  • Useful micro-organisms  
    • Experiment
    • Uses of Microorganisms:
  • Disease  
    • Introduction
    • Identification of disease
  • Manifestation of Diseases  
  • Categories of Disease  
    • Categories of Disease
    1. Extent of occurrence
      - Endemic diseases
      - Epidemic diseases
      - Pandemic diseases
      - Sporadic diseases
    2. Communicability: Communicable or Infectious diseases & Non- Communicable or Non-Infectious diseases
    3. Kinds of pathogens
    4. Kinds of transmitting agents
    5. Congenital diseases and acquired diseases
    6. Other types of diseases
      - Infectious diseases
      - Hereditary diseases
      - Physiological diseases
      - Deficiency diseases
  • Harmful Microorganisms  
  • Airborne Diseases  
  • Airborne Diseases Caused by Virus  
    • Airborne Diseases Caused by Virus
    1. Hepatitus A
    2. Hepatitus E
  • Airborne Diseases Caused by Bacteria  
  • Contamination of Water and Water Borne Diseases  
    • Waterborne diseases
    • Contamination of Water
    • Prevention of Waterborne Diseases
  • Waterborne Diseases Caused by Virus  
    • Waterborne Diseases Caused by Virus
    1. Hepatitus A
    2. Hepatitus E
  • Waterborne Diseases Caused by Bacteria  
    • Waterborne Diseases Caused by Bacteria:
    1. Diarrhoea
    2. Dysentery (Shigellosis)
    3. Typhoid Fever Bacteria (Salmonella)
    4. Cholera
  • Vector Borne Diseases  
  • Common Diseases in Human Beings  
    • Protozoan Diseases  
    • Helminthic Diseases  
  • Diseases Transmitted by Animals  
23 Economic Biology
24 Environmental Science
25 Computer – LibreOffice Impress
  • Libreoffice  
  • Presentation  

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