हिंदी
Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9
पाठ्यपुस्तक उत्तर७६०९
अवधारणा स्पष्टीकरण३२५
पाठ्यक्रम

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 and their Unit wise marks distribution

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
    • 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  
  • 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
    • Experiment
  • Properties of magnetic lines of force  
  • Effects of Electric Current  
  • Force on a Current Carrying Conductor in a Magnetic Field  
  • Force on Parallel Current Carrying Conductors  
  • Electric Motor  
    • Introduction
    • Construction and Working
    • Application
  • Electromagnetic Induction  
  • Faraday's Laws of Electromagnetic Induction  
    • Definition: Neumann's law
    • Explanation of the First Law
    • Definition: Lenz's law
    • Explanation of the Second Law
  • Alternating Current (A.C.) Generator  
    • Alternating current generator
    • Principle
    • Construction and its main parts
    • Working
    • Frequency of alternating current
  • Direct Current Motor  
    • Direct Current Motor
    • Principle
    • Construction and its main parts
    • Working
    • Ways of increasing the speed of rotation of coil
  • Distinction Between an A.C. Generator and D.C. Motor  
    • Distinction between an A.C. generator and D.C. motor
    • Similarities between an A.C. generator and D.C. motor
  • Electric Generator  
    • Introduction
    • Types of Electric Generator
    • Components of an Electric Generator
    • Working of an AC Generator
    • AC Generator vs. DC Generator
    • Application of an Electric Generator
  • Transformers  
    • Introduction
    • Construction
    • Theory
    • Energy Losses in a Transformer
    • Utility of Transformers in Long-distance Power Transmission
  • 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
  • Applications of Electromagnets  
6 Light
7 Heat
  • Heat and Its Unit  
  • 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 
  • Radiation  
    • Definition: Radiation
    • Definition: Thermal radiation
    • Relation between a, r and t
    • Athermanous and diathermanous substances
    • Greenhouse effect
    • Mechanism of Radiation
  • The Temperature and a Thermometer  
    • Introduction
    • 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  
    • Introduction
    • Specific Heat Capacity of Different Substances
    • Experiment
    • Heat Capacity (Thermal Capacity)  
      • Equation Derivation
      • Example  
  • Change of State  
    • Definition: Change of State
    • 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)  
  • Sublimation  
    • Introduction
    • Experiment
  • Latent Heat and Specific Latent Heat  
    • Introduction
    • Types of Latent Heat
    • Experiment
    • Latent Heat of Vaporization
8 Sound
9 Universe
10 Matter Around Us
11 Atomic Structure
12 Periodic Classification of Elements
13 Chemical Bonding
  • Chemical Bond  
    • Introduction
    • Kossel-Lewis Approach to Chemical Bonds
    • Lewis Dot Structure
  • Types of Chemical Bond  
  • Ionic or Electrovalent Bond  
    • Ionic bond or Electrovalent bond
    • Mechanism of formation of ionic bond
    • Lattice enthalpy
    • Factors affecting the formation of an ionic bond
      i) Low ionization enthalpy
      ii) High negative electron gain enthalpy
      iii) Large lattice enthalpy
    • Characteristics of ionic or electrovalent compounds
    • Difference between ionic bond and covalent bond
    • Covalent character in ionic bond
    • Fajan's rules
  • The Covalent Bond  
    • Introduction of Covalent Bond
    • Formation of Covalent Bonds
    • Properties of Covalent Compounds
  • Formation of Covalent Bond  
    • Formation of Covalent Bond:
    1. Hydrogen molecule (Non-polar compound)
    2. Chlorine molecule (Non-polar compound)
    3. Oxygen molecule (non-polar compound)
    4. Nitrogen molecule (Non-polar compound)
    5. Hydrogen chloride (polar compound)
    6. Water molecule (polar compound)
    7. Ammonia molecule (polar compound)
    8. Carbon tetrachloride molecule (Non-polar compound)
    9. Methane molecule (Non-polar compound)
  • Fajan’s Rule  
  • Coordinate Bond  
    • Coordinate Bond
    • Characteristics of coordinate covalent compounds
  • 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-)
  • Oxidation, Reduction and Redox Reactions  
    • Oxidation
    • Reduction 
    • Redox Reactions (Reduction + Oxidation)
    • Oxidising & Reducing Agents
14 Acids, Bases and Salts
  • Acids  
    • Definition
    • Introduction of Acid
    • Types of acid based on the source
    • Types of acid based on the presence of oxygen
    • Types of acid based on the strength of the acid
    • Types of acid based on its concentration
    • Types of acid based on the basicity of the acid
  • Properties of Acids  
  • Classification of Acids  
    • Classification of Acids
    1. Depending on their sources
      (a) Organic acids
      (b) Inorganic acids (mineral acids)
    2. Depending on their basicity
      (a) Monobasic acids
      (b) Dibasic acids
      (c) Tribasic acids
  • Uses of Acids  
  • Aquaregia  
  • Bases (Alkalis)  
    • Introduction of Base
    • Types of bases based on acidity
    • Types of bases based on therir concentration in aqueous solution
    • Types of bases based on their degree of ionisation
  • Properties of Bases (Alkalis)  
  • Classification of Bases (Alkalis)  
    • Classification of Bases (alkalis)
    1. Based on Ionisation
      (a) A strong alkali
      (b) A weak alkali
    2. On the basis of their basicity
      (a) Monoacidic base
      (b) Diacidic base
      (c) Triacidic base
    3. Based on concentration
      (a) Concentrated Alkali
      (b) Dilute Alkali
  • Uses of Bases  
  • Making of natural indicator  
    • Experiment: 1
    • Experiment: 2
    • Experiment: 3
  • Strength of Acidic or Basic Solutions  
    • pH Scale
    • Importance of pH in Everyday Life
  • Salts  
    • Introduction of Salts
    • Family of Salts
    • pH Value of a Salt
  • Classification of Salts  
    • Experiment 
    • Classification of Salts
  • Water of Crystallization  
    • Introduction
    • Experiment 1
    • Experiment 2
  • Properties of Salts  
  • Identification of Salts  
  • Important Salts in Daily Life  
    • Introduction
    • Experiment
  • Similarities and Differences Between Acids and Bases  
    • Similarities and differences between acids and bases
    • Acid solution in water conducts electricity
    • What Happens to an Acid or a Base in a Water Solution?
15 Carbon and Its Compounds
16 Applied Chemistry
  • Applied Chemistry  
  • Nanochemistry  
  • Pharmaceutical Chemistry  
  • Anaesthetics  
  • Antacid  
  • 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
  • Microorganisms (Microbes) and Microbiology  
    • Introduction of Microorganisms
    • Types of Microorganisms
    • Classification of Microorganisms
    • Experiment
    • Nature of microorganisms
    • Growth of microorganisms
  • 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  
    • Vector
    • Vector Borne Diseases: Mosquitoes, Cockroaches and Rats
    1. Malaria
    2. Elephantiasis (filariasis)
    3. Yellow fever
    4. Dengue
    • Control of mosquitoes:
    1. Spraying
    2. Elimination of breeding places
    3. Spraying on stagnant water
    4. Biological control
  • Common Diseases in Human Beings  
  • Diseases Transmitted by Animals  
  • Vaccination and Immunization  
    • Vaccination
    • Immunization
23 Economic Biology
24 Environmental Science
25 Computer – LibreOffice Impress
  • Libreoffice  
  • Presentation  

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