Science SSLC (English Medium) Class 7 Tamil Nadu Board of Secondary Education Syllabus 2025-26

• Measurement
• The need for measurement in daily life

• Introduction
• Types of Physical Quantities

• Density
• Unit of Density
• Relationship between S.I. and C.G.S. units

• Astronomical unit
• Light year
• Parsec

• Introduction
• Experiment

• Velocity
• Formula of Velocity
• Unit of Velocity
• Examples of Velocity

• Acceleration
• Retardation
• Experiment

• Centre of Gravity
• Centre of gravity of some regular uniform objects
• Centre of gravity and the balance point
• Determination of centre of gravity of an irregular lamina by the method of balance using a plumb line
• Real-Life Applications of Centre of Gravity

• Equilibrium of bodies (Stability)
• Kind of Equilibrium

1. Static equilibrium
2. Dynamic equilibrium
3. Stable equilibrium
4. Unstable equilibrium
5. Neutral equilibrium

• Conditions for equilibrium

• Introduction of Atom
• Discovery of Charged Particles and the Structure of an Atom

• Molecule
• Properties of molecule

• Experiment 
• Elements

• Introduction
• General Properties of Metals
• Experiment

• Introduction
• General Properties of Non-Metals

• Metalloid
• General Properties of Metalloid

• Introduction
• Experiment 1
• Experiment 2

• Chemical formulae of compounds : A recapitulation

• Introduction of Atom
• Discovery of Charged Particles and the Structure of an Atom

• Introduction
• Dalton’s Atomic Theory
• Merits and Demerits
• Activity

• Discovery of Electrons
• Thomson’s Plum Pudding Model of the Atom
• Merits and Demerits

• Introduction
• Rutherford’s Nuclear atomic model
• Merits and Demerits

• Atomic number or Nuclear charge
• Nucleons
• Mass number
• Relationship between atomic number and mass number
• Representation of element
• Number of Neutrons (n)

• Introduction of Isotopes
• Applications of Isotopes

• Introduction
• Example of Isobars
• Characteristics of Isobars

• Introduction
• Reproduction in Plants
• Importance of Variation
• Reproduction in Lower and Higher Animals
• Organisms Create Copies of Themselves

Mode of Reproduction in Plant:

1. Asexual reproduction

2. Sexual reproduction

• Sexual Reproduction in Flowering Plants
• Stages of Sexual Reproduction in Flowering Plants
  (i) Pre-fertilisation events
  (ii) Double fertilisation
  (iii) Post-fertilisation events

• Parts of a Flower
• Experiment

• Double Fertilization 
• Significance of Double Fertilization 
• Syngamy and Triple Fusion

• Asexual reproduction in plant

• Different modes of asexual reproduction in plant

1. Fragmentation
2. Budding
3. Spore formation
4. Binary fission
5. Conidia formation
6. Gemma formation

• Introduction
• The Importance of Hygiene for Health and Well-being

• Personal Hygiene
• Major aspect of personal hygiene

1. Cleanliness
2. Physical exercise
3. Rest and sleep
4. Healthy habits

• Introduction
• Identification of disease

• Introduction
• Infectious and Non-infectious causes of Disease

• First Aid
• Basic Principles of First Aid
• Simple Steps for Providing First Aid in Different Situations

• Introduction
• Experiment: 1
• Experiment: 2

• Thermometer and its working
• Types 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

• Ampere: Pioneer of Electric Current Measurement
• Electric Current

• Electrostatic Potential
• Potential Difference
• Experiment 1
• Experiment 2
• Experiment 3

• Electrical Resistivity
• Unit of specific resistance
• Factors affecting the specific resistance
• Conductance and Conductivity

• Resistance (R)
• Cause of resistance
• Factors affecting the resistance of a conductor

• Introduction of Electric Cell
• Types of Electric Cells
• Experiment

• Switch
• Switches in two groups
• Reason for connecting the switch in the live wire
• Safety precaution while using a switch

• Introduction
• Working
• Electric Circuits and Circuit Diagrams
• Experiment
• Joule’s Law of Heating and Electrical Power

• Conductors
• Insulators (Non-Conductors)

• Chemical and Physical Changes
• Experiment

• Introduction
• Effect of Change of Temperature
• Effect of Change of Pressure
• Heat Required to Change State

• Introduction
• Types of Chemical Reaction
• Experiment

• Endothermic Reactions
• Exothermic Reactions
• Experiment

• The Fundamental Unit of Life: Cell
• Discovery of Cells

• Plant Cell
• Animal Cell
• Difference between Plant Cell and Animal Cell

• Introduction
• Classification and Evolution of Diversity in Living Organisms
• Classification of Living Things

• Levels of organisation

• Cellular level of organisation
• Tissue level of organisation
• Organ system level of organisation

• Diploblastic and Triploblastic organisation
• Patterns of symmetry
• Coelom
• Segmentation and Notochord

• Classification
• Need for Classification
• Advantages of Classification

• Introduction
• Hierarchy Classification
• Five Kingdom Classification

• Introduction
• Experiment

• Introduction
• Experiment

• Introduction
• Experiment

• Kingdom Animalia
• Characteristics of Kingdom Animalia

• Non Chordates (Invertebrata)
• Chordates 

• Chordata: Prochordata
• Chordata: Vertebrata

• Comparison of chordates and non-chordates

• Taxonomy
• Systematics
• Classification of Taxonomy

1. Plant Taxonomy
2. Animal Taxonomy

• Introduction
• Experiment 1
• Experiment 2

• Introduction
• Experiment

• Introduction
• Activity
• Experiment

• Laws of Reflection
• Experiment

• Speed of light
• Speed of light in different mediums

• Introduction
• Activity
• Experiment

• Formation of Image by Reflection

1. Real Image
2. Virtual Image
3. Distinction between a real and a virtual image

• 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

• Galaxy
• Types of Galaxy

• Moon 
• Phases of Moon
• The lunar month and days (tithi)

• Stars
• Lifecycle of Stars
• Types of Stars

• Satellites
• Asteroids
• Dwarf planets
• Comet 
• A meteor 

• ISRO
• Satellite Launching and Applications
• Earth Observation and Disaster Management
• Space Exploration Milestones
• Cost-Effective Innovations and Societal Impact

• Early Moon Missions (Soviet Union & USA)
• Chandrayaan-1: India’s First Lunar Mission
• Objectives and Goals of Chandrayaan-1

• India’s Mars Mission (Mangalyaan)
• Indian-Origin Astronauts and Space Heroes

• Chandrayaan-2: India’s Second Lunar Mission
• Objectives and Goals of Chandrayaan-2

• Introduction
• Working
• Function

• Materials
• Plastic: A Manmade Material
• Properties of Plastic

• Thermoplastic
• Thermosetting Plastics

• Introduction of Glass
• Production of Glass
• Properties of Glass

• Types of Glass
• Environmental Impact of Glass

• Antibiotics and Their Mechanisms
• Types of Antibiotics
• Antibiotic Resistance
• Modern Applications of Antibiotics

• Antiseptics
• Disinfectants
• Differences between antiseptics and disinfectants

• Introduction
• The Evolution and Functionality of CO₂ Based Fire Extinguishers
• Working and Application

• Poultry Farm Management
• Components of Poultry Farm Management
• Egg and Broiler Production
• Poultry Disease