CBSE Class 10 Science Revision Notes for All Chapters

CBSE Class 10 Science Revision Notes summarise the main concepts, reactions, diagrams, formulas and scientific processes covered across 13 chapters. The notes follow the current NCERT Class 10 Science textbook used for CBSE learning in India.

Class 10 Science connects chemical changes, living processes, light, electricity, magnetism and environmental relationships. The subject requires conceptual understanding along with equations, diagrams, activities and numerical practice.

Use these CBSE Class 10 Science Revision Notes for quick revision during the 2026–27 academic year. Begin with the chapter summary, revise key terms and then practise the related NCERT questions.

Key Takeaways

• 13 chapters: The current NCERT Class 10 Science textbook begins with Chemical Reactions and Equations and ends with Our Environment.
• Four Chemistry chapters: Chapters 1 to 4 cover reactions, acids, metals and carbon compounds.
• Four Biology chapters: Chapters 5 to 8 cover life processes, coordination, reproduction and heredity.
• Four Physics chapters: Chapters 9 to 12 cover light, the human eye, electricity and magnetic effects.

Access CBSE Class 10 Science Revision Notes in 30 Minutes

Revise the subject in three parts:

• First 10 minutes: Chemical reactions, acids and bases, metals, non-metals and carbon compounds
• Next 10 minutes: Life processes, control and coordination, reproduction and heredity
• Final 10 minutes: Light, the human eye, electricity, magnetism and Our Environment

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Chapter-Wise CBSE Class 10 Science Notes

The current Chapter-wise CBSE Class 10 Science Notes cover 13 chapters. The sequence follows the NCERT Science textbook reprinted for the 2026–27 academic year.

These Class 10 Science Notes Chapter-wise provide a quick overview of every chapter. Students can use the table to identify which concepts require formula practice, diagram revision or explanation-based answers.

Chemistry Topics in CBSE Class 10 Science Revision Notes

Chemistry in Class 10 begins with observable chemical changes. It then moves towards acids, metals and the special bonding behaviour of carbon.

Chemical Reactions and Equations

A chemical reaction forms one or more new substances. Common signs include colour change, gas formation, temperature change and precipitate formation.

A chemical equation represents reactants and products using symbols and formulas.

Example:

Magnesium + Oxygen → Magnesium oxide

2Mg + O₂ → 2MgO

A balanced equation has the same number of atoms of each element on both sides.

Important reaction types include:

• Combination reactions
• Decomposition reactions
• Displacement reactions
• Double displacement reactions
• Oxidation and reduction reactions

Corrosion slowly damages metals through reactions with substances in the surroundings. Rancidity occurs when oils and fats undergo oxidation and develop an unpleasant smell or taste.

Acids, Bases and Salts

Acids produce hydrogen ions in an aqueous solution. Bases produce hydroxide ions in an aqueous solution.

Indicators help identify acidic and basic substances. Litmus, phenolphthalein and methyl orange show different colour changes.

The pH scale measures how acidic or basic a solution is. Values below 7 indicate acidity, 7 is neutral and values above 7 indicate basicity.

Neutralisation occurs when an acid reacts with a base.

Acid + Base → Salt + Water

Important salts and compounds include:

• Sodium chloride
• Baking soda
• Washing soda
• Bleaching powder
• Plaster of Paris

Students need to revise their formulas, preparation methods and common uses.

Metals and Non-metals

Metals generally show lustre, malleability, ductility and electrical conductivity. Non-metals usually show different physical properties, though exceptions exist.

The reactivity series arranges metals according to their tendency to react. A more reactive metal can displace a less reactive metal from its salt solution.

Example:

Zn + CuSO₄ → ZnSO₄ + Cu

Metal extraction depends on the reactivity of the metal. Highly reactive metals require different methods from metals with low reactivity.

Ionic compounds form through the transfer of electrons. They generally have high melting points and conduct electricity in molten or dissolved states.

Carbon and its Compounds

Carbon forms a large number of compounds because of tetravalency and catenation.

Tetravalency means carbon forms four covalent bonds. Catenation means carbon atoms can link with other carbon atoms to form chains and rings.

A homologous series contains compounds with the same functional group and general formula. Successive members differ by a CH₂ unit.

Important groups include:

• Alcohol
• Aldehyde
• Ketone
• Carboxylic acid

Ethanol and ethanoic acid are important carbon compounds. Soaps and detergents clean by helping oily dirt mix with water.

Biology Topics in CBSE Class 10 Science Revision Notes

Biology chapters explain how organisms maintain life, respond to changes, reproduce and pass traits to the next generation.

Life Processes

Life processes are activities required to maintain an organism. The chapter mainly covers nutrition, respiration, transportation and excretion.

Autotrophic nutrition occurs when organisms prepare food from simple substances. Green plants use carbon dioxide and water to make food through photosynthesis.

Carbon dioxide + Water → Glucose + Oxygen

Human digestion begins in the mouth and continues through the alimentary canal. Different organs and enzymes act on carbohydrates, proteins and fats.

Respiration releases energy from food. Aerobic respiration uses oxygen, while anaerobic respiration occurs without oxygen.

Transportation in humans involves the heart, blood and blood vessels. Plants transport water, minerals and food through specialised tissues.

Excretion removes metabolic waste. Kidneys filter blood and form urine in human beings.

Control and Coordination

Control and coordination allow organisms to respond to changes in their surroundings.

The nervous system receives information and produces a quick response. Neurons carry electrical signals through the body.

A reflex action is a rapid and automatic response. The reflex arc usually involves a receptor, sensory neuron, spinal cord, motor neuron and effector.

The brain controls different functions through specialised regions. Hormones provide slower chemical coordination.

Plants do not have a nervous system. They respond through growth movements and plant hormones.

How do Organisms Reproduce?

Reproduction produces new individuals and maintains the continuity of a species.

Asexual reproduction involves one parent. Methods include:

• Fission
• Fragmentation
• Regeneration
• Budding
• Vegetative propagation
• Spore formation

Sexual reproduction involves the formation and fusion of gametes. It creates variations among offspring.

In flowering plants, reproduction involves pollination, fertilisation, seed formation and fruit formation.

The chapter also covers the male and female reproductive systems, fertilisation, pregnancy and reproductive health.

Heredity

Heredity is the transmission of traits from parents to offspring.

Genes carry information for traits. Different forms of a gene can influence how a characteristic appears.

Mendel studied the inheritance of traits through experiments on pea plants. His work helped explain dominant and recessive traits.

Inherited traits pass through reproductive cells. Acquired traits usually develop during an organism’s lifetime and do not pass through genes.

In human beings, chromosomes help determine biological sex. The father contributes either an X chromosome or a Y chromosome.

Physics Topics in Class 10 Science Notes

Physics chapters connect light, vision, electric circuits and magnetic effects with everyday devices and observations.

Light – Reflection and Refraction

Reflection occurs when light returns to the same medium after striking a surface.

Spherical mirrors include concave and convex mirrors. Their image properties depend on the object’s position.

The mirror formula is:

1/f = 1/v + 1/u

Magnification for a mirror is:

m = hᵢ/hₒ = -v/u

Refraction occurs when light changes direction while passing from one transparent medium to another.

Convex lenses usually converge light, while concave lenses diverge light.

The lens formula is:

1/f = 1/v - 1/u

Magnification for a lens is:

m = hᵢ/hₒ = v/u

Students need to apply the correct sign convention before substituting values.

The Human Eye and the Colourful World

The human eye forms images on the retina. The eye lens changes its focal length to focus on nearby and distant objects.

This ability is called accommodation.

Common vision defects include:

• Myopia
• Hypermetropia
• Presbyopia

Suitable lenses correct these defects.

A prism can split white light into its component colours. This process is called dispersion.

Atmospheric refraction causes effects such as the apparent twinkling of stars. Scattering of light explains the blue colour of the sky and the reddish appearance of the Sun near the horizon.

Electricity

Electric current is the rate of flow of electric charge.

I = Q/t

Potential difference is the work done per unit charge.

V = W/Q

Ohm’s law states that the potential difference across a conductor is directly proportional to the current through it at constant temperature.

V = IR

Resistance depends on length, area of cross-section and material.

R = ρl/A

For resistors in series:

R = R₁ + R₂ + R₃

For resistors in parallel:

1/R = 1/R₁ + 1/R₂ + 1/R₃

Electric power is:

P = VI

It can also be written as:

P = I²R

P = V²/R

The heating effect of current is used in appliances such as heaters and electric irons.

Magnetic Effects of Electric Current

An electric current produces a magnetic field around a conductor.

Magnetic field lines show the direction and strength of the field. They form closed curves and do not intersect.

The right-hand thumb rule gives the direction of the magnetic field around a straight current-carrying conductor.

A solenoid produces a magnetic field similar to that of a bar magnet.

A current-carrying conductor placed in a magnetic field experiences force. Fleming’s left-hand rule helps determine its direction.

An electric motor converts electrical energy into mechanical energy.

Electromagnetic induction occurs when a changing magnetic field produces current in a conductor. An electric generator uses this principle to convert mechanical energy into electrical energy.

Environmental Concepts in Class 10 Science

The final chapter studies relationships between organisms and their surroundings.

Our Environment

An ecosystem contains living organisms and non-living components interacting within an area.

Producers prepare food. Consumers obtain food from plants or other organisms. Decomposers break down dead matter and return nutrients to the environment.

A food chain shows the transfer of food and energy.

Grass → Deer → Tiger

Each step forms a trophic level. Energy decreases as it moves from one trophic level to the next.

Biodegradable substances can be decomposed by biological processes. Non-biodegradable substances remain in the environment for long periods.

The ozone layer absorbs harmful ultraviolet radiation. Certain chemicals can damage this protective layer.

Important Class 10 Science Formulas and Terms

The following table provides a compact revision of important concepts from the NCERT Class 10 Science Notes.

How to Use Chapter-Wise Science Notes with NCERT

These Science Notes for Class 10 work best when used with the textbook, diagrams and practice questions.

For Chemistry, revise the reaction type before balancing an equation. Write the physical states where required and learn the conditions under which a reaction occurs.

For Biology, practise labelled diagrams after reading the process. Diagrams of the heart, nephron, neuron, reproductive systems and reflex arc require correct labels.

For Physics, write the formula before substituting values. Use the sign convention carefully in light numericals and include SI units in electricity answers.

For environmental concepts, focus on relationships. Food chains, decomposers, trophic levels and biodegradable waste are easier to remember through connected examples.

The NCERT textbook uses activities and in-text questions to develop concepts. Revision notes can summarise these ideas, but students should still review the original activity or example when a concept remains unclear.