Tamil Nadu Board of Secondary Education Class 7 Science Syllabus - Free PDF Download
Tamil Nadu Board of Secondary Education Syllabus 2025-26 Class 7: The Tamil Nadu Board of Secondary Education Class 7 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 7 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 7 Science Syllabus for 2025-26 is below.
Academic year:
Tamil Nadu Board of Secondary Education Class 7 Science Revised Syllabus
Tamil Nadu Board of Secondary Education Class 7 Science and their Unit wise marks distribution
Tamil Nadu Board of Secondary Education Class 7 Science Course Structure 2025-26 With Marking Scheme
| # | Unit/Topic | Weightage |
|---|---|---|
| 1 | Term - 1 | |
| 1.1 | Measurement | |
| 1.2 | Force and Motion | |
| 1.3 | Matter Around Us | |
| 1.4 | Atomic Structure | |
| 1.5 | Reproduction and Modification in Plants | |
| 1.6 | Health and Hygiene | |
| 1.7 | Visual Communication | |
| 2 | Term - 2 | |
| 2.1 | Heat and Temperature | |
| 2.2 | Electricity | |
| 2.3 | Changes Around Us | |
| 2.4 | Cell Biology | |
| 2.5 | Basis of Classification | |
| 2.6 | Digital Painting | |
| 3 | Term - 3 | |
| 3.1 | Light | |
| 3.2 | Universe and Space | |
| 3.3 | Polymer Chemistry | |
| 3.4 | Chemistry in Daily Life | |
| 3.5 | Animals in Daily Life | |
| 3.6 | Visual Communication | |
| Total | - |
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Syllabus
1: Term - 1
Tamil Nadu Board of Secondary Education Class 7 Science Syllabus
1.1 Measurement
- Measurements
- Measurement
- The need for measurement in daily life
- Physical Quantities
- Introduction
- Types of Physical Quantities
- Area and It’s Unit
- Measurement of Area
- Volume and It’s Unit
- Vessels for Measuring the Volume
- Measurement of Volume
- Density and It’s Unit
- Density
- Unit of Density
- Relationship between S.I. and C.G.S. units
- Density of a Substance in Its Different States
- Measuring Larger Distances
- Astronomical unit
- Light year
- Parsec
1.2 Force and Motion
- Distance and Displacement
- Introduction
- Experiment
- Speed
- Types of Speed
- Velocity
- Velocity
- Formula of Velocity
- Unit of Velocity
- Examples of Velocity
- Types of Velocity
- Acceleration and Retardation
- Acceleration
- Retardation
- Experiment
- Types of Acceleration
- Graphical Representation of Motion
- Displacement - Time Graph Or Distance - Time Graph
- Distance-time graph for uniform motion
- Distance-time graph for non-uniform motion
- Velocity - Time Graphs
- Velocity-time graph for uniform velocity
- Velocity-time graph for uniform acceleration
- Displacement - Time Graph Or Distance - Time Graph
- Comparison Between Distance – Time and Speed – Time Graphs
- Centre of Gravity
- Introduction
- Definition: Center of Gravity
- Characteristics
- Process: Determining the c.g. of a Laminar Object
- Centre of Mass (c.m.) vs. Centre of Gravity (c.g.)
- Real-Life Examples
- Equilibrium of Bodies
- Introduction
1.3 Matter Around Us
- Atoms: Building Blocks of Matter
- Introduction of Atom
- Discovery of Charged Particles and the Structure of an Atom
- Molecules
- Molecule
- Properties of molecule
- Classification of Molecules
- Elements
- Experiment
- Elements
- Types of Element: Metals
- Introduction
- General Properties of Metals
- Experiment
- Types of Element: Non-metal
- Introduction
- General Properties of Non-Metals
- Type of Element: Metalloid
- Metalloid
- General Properties of Metalloid
- Symbols Used to Represent Atoms of Different Elements
- Compound
- Introduction
- Experiment 1
- Experiment 2
- Chemical Formula or Molecular Formula
- Chemical formulae of compounds : A recapitulation
- Atomicity
- Effect of Heat on Solid, Liquid and Gases
1.4 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
- 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
- Lord Rutherford’s Atomic model
- Introduction
- Rutherford’s Nuclear atomic model
- Merits and Demerits
- Limitations of Rutherford’s Atomic Model
- Structure of an Atom
- Atomic Number (Z), Mass Number (A), and Number of Neutrons (n)
- Atomic number or Nuclear charge
- Nucleons
- Mass number
- Relationship between atomic number and mass number
- Representation of element
- Number of Neutrons (n)
- 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
- Valency
- Isotopes
- Isobars
- Introduction
- Example of Isobars
- Characteristics of Isobars
1.5 Reproduction and Modification in Plants
- Mode of Reproduction in Plant
- Sexual Reproduction in Plants
- Modifications of Plant Parts
- Modification of Root
- Modification of Stems
- Modifications of Leaf
1.6 Health and Hygiene
- Hygiene
- Introduction
- The Importance of Hygiene for Health and Well-being
- Types of Hygiene: Personal Hygiene
- Personal Hygiene
- Major aspect of personal hygiene
- Cleanliness
- Physical exercise
- Rest and sleep
- Healthy habits
- Types of Hygiene: Public Hygiene (Community)
- Effective Ways to Maintain Good Health
- Disease
- Introduction
- Identification of disease
- Common Diseases in Human Beings
- Bacterial Diseases
- Bacterial diseases in human beings
- Typhoid ( Enteric fever)
- Pneumonia
- Shigellosis (Bacillary dysentery)
- Bubonic plague (Black death)
- Diphtheria
- Cholera
- Tetanus (Lock jaw)
- Tuberculosis
- Syphilis
- Whooping cough (Pertussis)
- Dysentery
- Plague
- Viral Diseases
- Introduction
- Common diseases
- Viral Diseases
- Bacterial Diseases
- Specific Health Problems of Children: Anaemia
- First Aid and Emergency Action
- First Aid
- Basic Principles of First Aid
- Simple Steps for Providing First Aid in Different Situations
1.7 Visual Communication
- File and Folder
- Creating Files
- Visual Communication Devices
- Photo Gallery and Photostory
- Graphics and Animation
- Dimensional and 3 Dimensional Images
2: Term - 2
Tamil Nadu Board of Secondary Education Class 7 Science Syllabus
2.1 Heat and Temperature
- The Temperature and a Thermometer
- Introduction
- Experiment: 1
- Experiment: 2
- Measuring Temperature
- Thermometer and Its Types
- Thermometer and its working
- Types of Thermometers
- Scales of Thermometers
- Fahrenheit scale
- Celsius temperature scale
- Kelvin scale (Absolute scale)
- Relationship between the three scales of temperature
- Conversion of Temperature from celsius scale to kelvin scale and vice-versa
- Numerical Problems of Heat
2.2 Electricity
- Electricity
- Electric Current
- Ampere: Pioneer of Electric Current Measurement
- Electric Current
- Derivation
- Direction of the Electric Current - Conventional and Electronic Flow
- Potential and Potential Difference
- Electrostatic Potential
- Potential Difference
- Experiment 1
- Experiment 2
- Experiment 3
- Electrical Resistivity and Conductivity
- Electrical resistivity (specific resistance)
- Conductivity
- Resistance (R)
- Resistance (R)
- Cause of resistance
- Factors affecting the resistance of a conductor
- Analogy of Electric Current with Water Flow
- Electro Chemical Cells
- Electric cell
- Introduction of Electric Cell
- Types of Electric Cells
- Experiment
- Battery
- Electric Switch
- Switch
- Switches in two groups
- Reason for connecting the switch in the live wire
- Safety precaution while using a switch
- Electric Circuit
- Concept of Electric Circuit
- Working
- Circuit Diagram
- Experiment
- Joule’s Law of Heating and Electrical Power
- Types of Circuits: Series Circuit
- Types of Circuits: Parallel Circuit
- Similarity and Difference Between Series and Parallel Circuit
- Precautions to Be Taken While Using Electricity
- Electrical Conduction in Solids
- Introduction
- Conductors
- Insulators
- Semiconductors
- Table
- Concept of Electrical Conductivity
- Classification of Semiconductors
- 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
- Magnetic Effect of Electric Current
- Introduction
- Experiment 1
- Experiment 2
- Experiment 3
- Chemical Effects of Electric Current
- Chemical effect of electric current
- Application of Chemical effect of electric current
- Electroplating
- Heating Effect of Electric Current
2.3 Changes Around Us
- Changes-Physical and Chemical
- Chemical and Physical Changes
- Experiment
- Effect of Heat on Solid, Liquid and Gases
- Classification of Change: Physical Changes
- 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 Boiling (Vaporization)
- Changes in States of Water
- Experiment
- Concept of Freezing (Solidification)
- Introduction
- Melting and Freezing Point of Water
- Boiling and Condensation Points
- Concept of Condensation (Liquefaction)
- Concept of Desublimation (Deposition)
- Concept of Evaporation
- Factors Affecting Evaporation
- How does Evaporation cause cooling?
- Sublimation
- Introduction
- Experiment
- Methods of Separation
- Chemical Reaction
- Introduction
- Types of Chemical Reaction
- Experiment
- Effects of Chemical Changes: Biological Effects
- Effects of Chemical Changes: Environmental Effects
- Factors Determining Chemical Changes
- Indicators of a Chemical Change (Chemical Reaction)
- Energy Change in Chemical Reactions
- Endothermic Reactions
- Exothermic Reactions
- Experiment
- Classification of Change: Periodic and Non-periodic Changes
2.4 Cell Biology
- Useful living things
- Cell to Organism
- Plant Cell and Animal Cell
- Plant Cell
- Animal Cell
- Difference between Plant Cell and Animal Cell
- Protoplasm
- Cell Organelles
- Mitochondria - “Power House of the Cell”
- Introduction
- Functions of Mitochondria
- Golgi Apparatus - "The delivery system of the cell"
- Introduction
- Functions of Golgi Apparatus
- Camilio Golgi
- Lysosome - “Suicidal Bag”
- Introduction
- Functions of Lysosomes
- Endoplasmic Reticulum (ER)
- Introduction
- Functions of ER
- Mitochondria - “Power House of the Cell”
2.5 Basis of Classification
- Introduction of Biological Classification
- Criteria for New System of Classification: Grades of Organization
- Classification of Living Organisms
- Classification
- Need for Classification
- Advantages of Classification
- Taxonomic Hierarchy of Living Organisms: Unit of Classification
- Five Kingdom Classification
- Introduction
- Hierarchy Classification
- Five Kingdom Classification
- Kingdom Monera
- Introduction
- Experiment
- Kingdom Protista
- Introduction
- Experiment
- Kingdom Fungi
- Introduction
- Experiment
- Classification of Kingdom Plantae
- Kingdom Animalia
- Kingdom Animalia
- Characteristics of Kingdom Animalia
- Cryptogams > Division II- Bryophytes
- Bryophyta
- Activity
- Cryptogams > Division III- Pteridophytes
- Phanerogams > Division II- Angiosperms
- Angiosperms
- Activity
- Classification of Angiosperms
- Phanerogams > Division I-Gymnosperms
- Non Chordates (Invertebrata)
- Phylum: Aschelminthes
- Phylum: Hemichordata
- Subphylum: Prochordata
- Phylum: Chordata
- Invertebrata and Vertebrata
- Non Chordates (Invertebrata)
- Chordates
- Chordata: Prochordata
- Chordata: Vertebrata
- Comparison of chordates and non-chordates
- Nomenclature
- Taxonomy and Systematics
- Taxonomy
- Systematics
- Classification of Taxonomy
- Plant Taxonomy
- Animal Taxonomy
2.6 Digital Painting
- Tux Paint
- Tux Math
3: Term - 3
Tamil Nadu Board of Secondary Education Class 7 Science Syllabus
3.1 Light
- Luminous and Non-luminous Bodies
- Sources of Light
- The propagation of light
- Introduction
- Experiment 1
- Experiment 2
- A Pinhole Camera
- Introduction
- Experiment
- Reflection of Light
- Introduction
- Activity
- Experiment
- Terms Used in Reflection of Light
- Law of Reflection of Light
- Laws of Reflection
- Experiment
- Types of Reflection
- Important Terms Related to Light
- Speed of Light
- Speed of light
- Speed of light in different mediums
- Formation of Shadow
- Introduction
- Activity
- Experiment
- Eclipse - an Astronomical Event
- Lateral Inversion
- Formation of Image by Reflection: Real and Virtual Image
- Formation of Image by Reflection
- Real Image
- Virtual Image
- Distinction between a real and a virtual image
- Prism
- Dispersion of Light and Prism
- Dispersion of Light Through a Prism
- Newton’s Disc and the Colours of Light
- Wavelength and Speed of Light in Different Media
- Activity 1
- Activity 2
- Activity 3
- Definition: Angular Dispersion
- Definition: Lateral Dispersion
- Example 1
- Colour
3.2 Universe and Space
- Sky Watching
- Geo Centric Theory
- Epicycle Model
- Heliocentric Model
- Galaxy and Its Types
- Galaxy
- Types of Galaxy
- Moon and Its Phases
- Moon
- Phases of Moon
- The lunar month and days (tithi)
- Stars and Their Types
- Stars
- Lifecycle of Stars
- Types of Stars
- Other Heavenly Bodies of the Solar System
- Satellites
- Asteroids
- Dwarf planets
- Comet
- A meteor
- Indian Space Research Organization (ISRO)
- ISRO
- Satellite Launching and Applications
- Earth Observation and Disaster Management
- Space Exploration Milestones
- Cost-Effective Innovations and Societal Impact
- India’s Space Programmes: Chandrayaan – 1
- Early Moon Missions (Soviet Union & USA)
- Chandrayaan-1: India’s First Lunar Mission
- Objectives and Goals of Chandrayaan-1
- India’s Space Programmes: Mangalyaan (Mars vehicle)
- India’s Mars Mission (Mangalyaan)
- Indian-Origin Astronauts and Space Heroes
- India’s Space Programmes: Chandrayaan – 2
- Chandrayaan-2: India’s Second Lunar Mission
- Objectives and Goals of Chandrayaan-2
- Fundamentals of Telescope
- Introduction
- Working
- Function
- The Missile Man of India: A.P.J. Abdul Kalam (1931-2015)
- Indian Scientist
3.3 Polymer Chemistry
- Polymer Chemistry: Polymer
- Fibre
- Fabrics
- Plant Fibres: Cotton
- Plant Fibre: Jute Fibre
- Animal Fibres: Wool
- Animal Fibre: Silk
- Man-made Fibre: Synthetic Fibres
- Man-made Fibre: Plastics
- Materials
- Plastic: A Manmade Material
- Properties of Plastic
- Types of Plastics
- Thermoplastic
- Thermosetting Plastics
- Identifying Different Types of Plastics: Resin Codes
- Harmful Effects of Plastics
- Biodegradable Plastics
- Recycling of Plastic
- Plastic Eating Bacteria
- Glass
- Introduction of Glass
- Production of Glass
- Properties of Glass
- Types of Glass
- Types of Glass
- Environmental Impact of Glass
3.4 Chemistry in Daily Life
- Pharmaceutical Chemistry
- Oral Rehydration Solution (ORS)
- Antacid
- Antibiotics
- Analgesics
- Antipyretic
- Antiseptics and Disinfectants
- Antiseptics
- Disinfectants
- Differences between antiseptics and disinfectants
- Antihistamine
- Combustion
- Types of Combustion
- Flame
- Precautions and Safety Measures
- Fire Extinguisher
- Introduction
- The Evolution and Functionality of CO₂ Based Fire Extinguishers
- Working and Application
3.5 Animals in Daily Life
- Animal Products used as Food
- Animal Products Used as Clothing
- Animal Fibres: Wool
- Animal Fibre: Silk
- Hazards in Silk and Wool Industry
- Animal Protection and Maintenance
3.6 Visual Communication
- Libreoffice
- Components of Libreoffice
- Text Document
