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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 8
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Syllabus

Science SSLC (English Medium) Class 8 Tamil Nadu Board of Secondary Education Syllabus 2025-26

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Tamil Nadu Board of Secondary Education Class 8 Science Syllabus - Free PDF Download

Tamil Nadu Board of Secondary Education Syllabus 2025-26 Class 8: The Tamil Nadu Board of Secondary Education Class 8 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 8 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 8 Science Syllabus for 2025-26 is below.

Academic year:

Tamil Nadu Board of Secondary Education Class 8 Science Revised Syllabus

Tamil Nadu Board of Secondary Education Class 8 Science and their Unit wise marks distribution

Tamil Nadu Board of Secondary Education Class 8 Science Course Structure 2025-26 With Marking Scheme

#Unit/TopicWeightage
1  Measurement 
2  Force and Pressure 
3  Light 
4  Heat 
5  Electricity 
6  Sound 
7  Magnetism 
8  Universe and Space Science 
9  Matter Around Us 
10  Changes Around Us 
11  Air 
12  Atomic Structure 
13  Water 
14  Acids and Bases 
15  Chemistry in Everyday Life 
16  Microorganisms 
17  Plant Kingdom 
18  Organisation of Life 
19  Movements in Animals 
20  Reaching the Age of Adolescence 
21  Crop Production and Management 
22  Conservation of Plants and Animals 
23  Libre Office Calc 
 Total -
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Syllabus

1 Measurement
2 Force and Pressure
  • Force  
  • Effect of Force  
    • A Force can change the State of motion
    • Force can change the shape of an object
    • Stops or tries to stop a moving body
    • Changes or tries to change the direction of motion of a moving body
    • Like parallel forces effect
    • Unbalanced forces effect
    • Unlike parallel forces effect
  • Thrust and Pressure  
    • Introduction
    • Unit of pressure
    • Experiment
  • Factors Affecting Pressure  
  • Atmospheric Pressure  
  • Measurement of Atmospheric Pressure  
    • Mercury Barometer (Simple Barometer)  
  • Buoyancy Force (Upthrust Force)  
    • Introduction
    • Experiment 1
    • Experiment 2
  • Pressure of liquid  
    • Introduction
    • Experiment 1
    • Experiment 2
  • Pascal’s Law  
  • Application of Pascal’s Law  
    • Applications of Pascal's law
    1. Hydraulic press
    2. Hydraulic lift
    3. Hydraulic brakes
  • Surface Tension  
    • Surface Tension
    • Force due to surface tension
    • Factors affecting surface tension
      1) Nature of liquid
      2) Impurities
      3) Temperature
      4) Electrification
    • Applications of surface tension
  • Viscous Force or Viscosity  
    • Viscosity
    • Newton's law of viscosity
    • Coefficient of viscosity
    • Applications of coefficient of viscosity
  • Force of Friction  
  • Kinds of Friction  
  • Advantages and Disadvantage of Friction  
  • Increasing and Reducing Friction  
3 Light
4 Heat
  • Heat and Its Unit  
  • Effects of Heat  
  • Transfer of Heat  
    • Conduction  
      • Introduction
      • Experiment
    • Convection  
      • Introduction
      • Experiment
    • Radiation  
      • Introduction
      • Experiment 1
      • Experiment 2
      • Experiment 3
  • Calorimetry and Calorimeter  
    • Calorimetry
    • Calorimeter
    • Working of Calorimeter
    • Application of Calorimeter
  • 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
  • Thermal Capacity (Heat Capacity)  
    • Heat capacity or Thermal capacity
    • Units of heat capacity
  • Specific Heat Capacity  
    • Introduction
    • Specific Heat Capacity of Different Substances
    • Experiment
  • Thermostat  
  • Thermos Flask (Dewar Flask)  
    • Introduction
    • Structure and Working
    • Function of the thermos flask
5 Electricity
  • Electricity  
  • Structure of an Atom  
  • Electric Charge  
    • Introduction
    • Experiment
  • Electric Force  
  • Electric Field  
  • Transfer of Charges  
    • Origin of an Electric Charge
    • Experiment
  • Direction of the Electric Current - Conventional and Electronic Flow  
  • Flow of Charges (Electrons) Between Conductor  
  • Electroscope  
  • Lightning and Lightning Safety  
    • Introduction
    • Causes of Lightning
    • Precautions to Stay Safe from Lightning
  • Electric Circuit  
    • Introduction
    • Working
    • Electric Circuits and Circuit Diagrams
    • Experiment
    • Joule’s Law of Heating and Electrical Power
  • Types of Circuits: Simple Circuit  
  • Types of Circuits: Series Circuit  
  • Types of Circuits: Parallel Circuit  
  • Effects of Electric Current  
    • Heating Effect of Electric Current  
      • Introduction
      • Joule’s Law of Heating
      • Applications
      • Units of Power and Energy
      • Safety Measures and Overloading
    • Chemical Effects of Electric Current  
      • Chemical effect of electric current
      • Application of Chemical effect of electric current
      1. Electroplating
6 Sound
  • Sound  
    • Introduction
    • Sound waves
  • Production of Sound  
    • Introduction
    • Production of Sound Using a Tuning Fork
    • Experiment
  • Propagation of Sound  
    • Introduction
    • Experiment 1
    • Experiment 2
  • Characteristics of a Sound Wave  
    • Sound Wave
    • Parts of a Sound Wave
    • Important Sound Wave Properties
  • Properties of Sounds  
    • Properties of Sound
    • Activity
    • Experiment
    • Loudness and Intensity  
    • Pitch (or shrillness) and frequency  
    • Quality (Or Timbre) and Wave Form  
      • Recognition of the sources of two sounds by their quality
    • Audibility and Range  
      • Audibility and Range
      • Bats and Their Navigation Mechanism
      • Experiment 
      • Uses of Different Types of Sound
  • Sound and Music  
    • Sound and Music
    • Experiment 
  • Sound Produced by Humans  
  • Human Ear  
    • Structure of Human Ear
    • Function of Human Ear
  • Environmental Issues  
    • Noise Pollution  
  • Hearing Loss  
7 Magnetism
8 Universe and Space Science
9 Matter Around Us
10 Changes Around Us
  • Chemical Reaction  
    • Introduction
    • Types of Chemical Reaction
    • Experiment
  • Factors Determining Chemical Changes  
  • Effects of Chemical Changes: Biological Effects  
  • Effects of Chemical Changes: Environmental Effects  
  • Effects of Chemical Changes: Production of Heat, Light, Sound and Pressure  
11 Air
  • Air Around Us  
  • Air is a Mixture  
  • Occurrence of Oxygen  
  • Properties of Oxygen  
  • Importance of Oxygen  
  • Occurrence of Nitrogen  
  • Properties of Nitrogen  
  • Importance of Nitrogen  
  • Nitrogen Fixation  
  • Composition and Components of Air  
    • Introduction
    •  Uses of Gases in Air
  • Carbon Dioxide  
    • Carbon Dioxide: Properties and Importance
    • Experiment
    • Physical and Chemical Properties
    • Uses of Carbon Dioxide
  • Properties of Carbon Dioxide  
  • Importance of Carbon Dioxide  
  • Green House Effect  
    • Green House Effect
    • Green House gases
  • Preventive Measures of Green House Effect  
  • Global Warming  
    • Global Warming
    • Causes of Global warming
    • Effect of Global Warming
  • Preventive Measures of Global Warming  
  • Acid Rain  
    • Acid rain
    • Effects of Acid rain
  • Preventive Measures of Acid Rain  
12 Atomic Structure
  • Atoms: Building Blocks of Matter  
    • Introduction of Atom
    • Discovery of Charged Particles and the Structure of an Atom
  • Dalton’s Atomic Theory  
    • Introduction
    • Dalton’s Atomic Theory
    • Merits and Demerits
    • Activity
  • Advantages and Limitations of Dalton’s Atomic Theory  
  • Discovery of Charged Particles in Matter  
    • Cathode Ray Tube (CRT) experiment
    • Electrons (e)  
      • Electrons
      • Discovery of Electrons
      • Properties of Cathode rays
      • Charge to Mass Ratio of Electron
      • Charge on the Electron
    • Protons (p)  
      • Protons
      • Discovery of Protons
      • Properties of Anode rays
    • Neutrons (n)  
      • Neutrons
      • Discovery of Neutrons
      • Properties of Neutrons
  • J. J. Thomson’s Atomic Model  
    • Discovery of Electrons
    • Thomson’s Plum Pudding Model of the Atom
    • Merits and Demerits
  • Advantage and Limitations of Thomson’s Atomic Model  
  • Periodic Properties  
    • Valency  
      • Valency Rules and Formula Formation
      • Valency and Electronic Configuration
      • Types and Trends in Valency
      • Methods to Determine the Valency of an Element
  • Different Ways to Determine Valency  
  • Variable Valency  
  • Ions (Radicals) and Its Types  
    • Radicals
    • Formation of Radicals
    • Types of Radicals
  • Different Valent Ions  
  • Chemical Formula or Molecular Formula  
    • Chemical formulae of compounds : A recapitulation
  • Naming Chemical Compounds  
  • Chemical Equation  
    • Introduction
    • Writing a Chemical Equation
    • Experiment
  • Balancing Chemical Equation  
    • Introduction
    • Steps to Balance a Chemical Equation (Hit-and-Trial Method)
  • Laws of Chemical Combination  
    • Introduction
    • Experiment
    • Law of Conservation of Mass  
    • Law of Constant Proportions (Law of Definite Proportions)  
      • Introduction
      • Antoine Lavoisier: The Father of Modern Chemistry
      • Verification of The Law of Constant Proportion
13 Water
  • Water: Our Lifeline  
    • Introduction
    • Importance of Water for Sustaining Life
  • Composition of Water  
    • Introduction
    • Water Cycle
  • Electrolysis of Water  
    • Introduction
    • Experiment
  • Preparation of Water  
  • Physical Properties of Water  
    • Physical Properties of Water:
    1. Nature
    2. Boiling point
    3. The freezing point of water or melting point of ice
    4. Density
    5. Anomalous expansion of water
    6. Latent heat of fusion of ice
    7. Latent heat of vaporization of water
    8. Specific heat capacity
  • Chemical Properties of Water  
    • Chemical properties
    1. Dissociation of water
    2. Amphoteric nature
    3. Oxidising and reducing nature
    4. Hydrolytic reactions
    5. Formation of hydrates with metal salts
  • Water - a Universal Solvent  
    • Universal Solvent
    • Experiment: To show that ordinary tap water contains dissolved solids.
    • Importance of dissolved salts in water.
    • Air dissolved in water.
    • Experiment: To show that tap water contains dissolved gases (air). 
    • Importance of air dissolved in water.
  • Potable Water  
  • Purification of Water  
  • Classification of water: Soft and Hard Water  
    • Soft and Hard water
    • Types of Hard water
    1. Temporary Hardness
    2. Permanent Hardness
  • Advantage and Disadvantage of Hard Water  
  • Removal of Hardness of Water  
    • Softening of water
    1. Removal of temporary hardness
      a) By boiling
      b) Clark's method
    2. Removal of permanent hardness
      a) By washing soda method
      b) lon-exchange/Permutit method
      c) Calgon method
      d) Synthetic resins method
      ⇒ Ion exchange resins are of two types
      i) Cation exchange resins
      ii) Anion exchange resins
    • Degree of hardness of water
  • Water Pollution and Its Causes  
    • Water Pollution
    • Types of Water Pollutants
    • Causes of Water Pollution
    • Reasons of Water Pollution
  • Prevention of Water Pollution  
  • Water Pollution in Tamilnadu  
14 Acids and Bases
  • 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  
  • Uses of Acids  
  • 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)  
  • Uses of Bases  
  • Types of Double Displacement: Neutralization Reaction  
    • Introduction of Neutralization
    • Application of Neutralization
  • Neutralization Reactions in Our Daily Life  
  • Indicators  
    • Introduction of Indicator
    • Types of Indicators
    • Concept of pH scale
    • Reactions
    • Experiment: 1
    • Experiment: 2
  • 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 Chemistry in Everyday Life
16 Microorganisms
17 Plant Kingdom
  • Biodiversity  
  • Classification of Kingdom Plantae  
    • Kingdom Plantae: Thallophyta (Algae)  
    • Kingdom Plantae: Thallophyta (Fungi)  
  • Cryptogams  
    • Division II- Bryophytes  
      • Bryophyta
      • Activity
    • Division III- Pteridophytes  
  • Phanerogams  
    • Division I-Gymnosperms  
    • Division II- Angiosperms  
      • Angiosperms
      • Activity
      • Classification of Angiosperms
  • Taxonomy and Systematics  
    • Taxonomy
    • Systematics
    • Classification of Taxonomy
    1. Plant Taxonomy
    2. Animal Taxonomy
  • Nomenclature  
  • Medicinal Plant  
18 Organisation of Life
  • Biological Organisation in Organisms  
  • Cell: Structural and Functional Unit of Life  
    • The Fundamental Unit of Life: Cell
    • Discovery of Cells
  • Organisms Show Variety in Cell Number, Shape and Size  
    • Cell Numbers
    • Cell Size
    • Smallness of Cells: A Greater Efficiency
    • Cell Shapes: To suit Functional Requirement
  • Tissues - “The Teams of Workers”  
    • Introduction
    • Differences Between Plant and Animal Tissues
  • Human Organ System  
  • Human Eye  
    • Structure and Components
    • Photoreceptors and Eye Muscles
  • Human Respiratory System  
    • Respiratory System
    • Exchange of Gases in Lungs
    • Significance of Respiration
  • Mechanism of respiration-Breathing  
    • Mechanism of Respiration
    • Steps of Respiration
  • Physiological Processes in Organisms  
  • Homeostasis  
  • Means of Transport in Plants  
    • Simple Diffusion  
    • Concept of Osmosis  
      • Endosmosis
      • Exosmosis
    • Osmotic Pressure  
      • Isotonic solution
      • Hypotonic solution
      • Hypertonic solution
  • Osmoregulation  
  • Types of Respiration: Aerobic and Anaerobic Respiration  
    • Cellular respiration
    • Types of cellular respiration
    1. Aerobic Respiration
    2. Anaerobic Respiration
    • Aerobic respiration in plant/animal
    • Anaerobic respiration in plant/animal
    • Differences in anaerobic respiration in plants and animals
  • Metabolism  
19 Movements in Animals
20 Reaching the Age of Adolescence
  • Adolescence and Puberty  
  • Changes at Puberty  
  • Secondary Sex Characteristics  
  • Role of Hormones in Initiating Reproductive Function  
  • Reproductive Phase of Life in Humans  
  • Menstrual Cycle (Ovarian Cycle)  
    • Menstrual Cycle (Ovarian Cycle)
    • Phases menstrual cycle
    1. Menstrual phase
    2. Follicular or proliferative phase
    3. Ovulatory phase
    4. Luteal or secretory phase
  • Reproductive Health  
    • Reproductive and Child Health Care (RCH) Programme
      - Goals of RCH Programmes
  • Nutritional Needs of Adolescents  
  • Personal Hygiene for Adolescence  
21 Crop Production and Management
  • Crop and Its Types  
  • The Green Revolution  
    • Introduction of Green Revolution
    • Role of Dr. M. S. Swaminathan
  • Soil Formation and Preparation for Agriculture  
  • Agricultural Implements  
  • Food Storage and Conservation of the Environment  
  • Manuring (Biomanuring)  
  • Fertilizers  
    • Introduction of Fertilizers
    • Harmful Effects of Chemical Fertilizers
    • Protection of crops
    • Steps for Storing Grain
    • Steps to Protect Grain from Damage
  • Methods to Replenish Nutrients in Your Soil  
  • Improved methods of agriculture  
    • Improved seeds
    • Irrigation
    • Modern methods of irrigation
    • Modern Irrigation Methods
  • Food Security  
    • Introduction of Food security
    • Importance of Food Security
  • Agricultural Assistance Programme  
  • Weeding  
  • Harvesting of Crops  
  • Storage of Food Grains  
  • Rotation of Crops  
  • Seed Bank  
  • Bio-indicators  
  • Agriculture Research Institutions  
  • Foliar Sprays  
  • Bio-control Methods  
22 Conservation of Plants and Animals
23 Libre Office Calc
  • Libre Office Calc  
  • Spreadsheet  
  • Worksheet and Workbook  
  • Merge Cells  
  • Generate Auto Numbers  
  • Functions  
  • Operators in Libre Office Calc  
  • Working with Charts  

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