CBSE Class 10 Science Top Priority Chapters 2026: Check detailed subject expert guidance

CBSE Class 10 Science Top Priority Chapters 2026: In conversation with S Balakrishna, Retired Govt School Science Teacher (Andhra Pradesh) with 25 years + experience in teaching, CollegeDekho has identified the top-most priority chapters and the least priority chapters for the upcoming CBSE Class 10 board exams 2026. The Science exam is scheduled to be held on February 25, 2026, so here is all to know about CBSE Class 10 Science Top Priority Chapters 2026 based on experts' opinion. This will help in the preparation for the exam as well as provide insights into what to cover first and what not to cover. Although it is always best to complete the entire syllabus, for students opting for selective studying or for last-minute revision, this will be handy.
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Experts' Guidance on CBSE Class 10 Science Top Priority Chapters 2026

Here is the detailed analysis of the past trends and reviews of the experts on CBSE Class 10 Science Top Priority Chapters 2026 for better understanding:
CollegeDekho: What is the chapter-wise weightage for CBSE Class 10 Science 2026?
Expert: As per the official blueprint, Units Chemical Substances-Nature and Behaviour and World of Living carry 25 marks each, followed by Effects of Current with 13 marks weightage and the unit Natural Phenomena with a weightage of 12 marks, and finally, with 5 marks weightage Natural Resources unit is expected to have the least number of questions.
CollegeDekho: Which are the most important topics to be covered from each unit for CBSE Class 10 Science 2026?
Expert: Considering the past trends, the expert has listed these topics from each of the units to have the most chances of being included in CBSE Class 10 Science 2026 question paper:
Unit I: Chemical Substances - Nature and Behaviour

• Chemical Reactions and Equations: Chemical reactions, Chemical equation, Balanced chemical equation, oxidation and reduction.
• Acids, Bases and Salts: Acids and Bases – definitions in terms of furnishing of H+ and OH– ions, chemical properties, concept of pH scale, importance of pH in everyday life; preparation and uses of Sodium Hydroxide.
• Metals and Non-metals: Properties of metals and non-metals; Reactivity series; Formation and properties of ionic compounds; Basic metallurgical processes; Corrosion and its prevention.
• Carbon and its Compounds: Covalent bonds – formation and properties of covalent compounds, Hydrocarbons – saturated and unsaturated Homologous series. Nomenclature of alkanes, alkenes, alkyne and carbon compounds containing functional groups (halogens, alcohol, ketones, aldehydes). Chemical properties of carbon compounds (combustion, oxidation, addition and substitution reactions).

Unit II: World of Living

• Life processes: Basic concept of nutrition, respiration, transport and excretion in plantsand animals.
• Control and co-ordination in animals and plants: Tropic movements in plants; Introduction of plant hormones; Control and coordination in animals: Nervous system; Voluntary, involuntary and reflex action; Chemical co-ordination: animal hormones.
• Reproduction: Reproduction in animals and plants (asexual and sexual), reproductive health. Childbearing and women’s health.
• Heredity and Evolution: Heredity; Mendel’s contribution- Laws for inheritance of traits.

Unit III: Natural Phenomena

• Reflection of light by curved surfaces; Images formed by spherical mirrors, the centre of curvature, principal axis, principal focus, focal length, and mirror formula.
• Refraction: Laws of refraction, refractive index. Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula, Power of a lens.
• Functioning of a lens in the human eye, defects of vision and their corrections, applications of spherical mirrors and lenses.
• Refraction of light through a prism, dispersion of light, and scattering of light.

Unit IV: Effects of Current

• Electric current, potential difference and electric current. Ohm’s law
• Resistance, Resistivity, Factors on which the resistance of a conductor depends.
• Series combination of resistors, parallel combination of resistors and their applications in daily life.
• Magnetic effects of current: Magnetic field, field lines, field due to a current-carrying conductor, field due to current carrying coil or solenoid;
• Force on current carrying conductor, Fleming’s Left Hand Rule, Direct current. Alternating current: frequency of AC.
• Advantages of AC over DC. Domestic electric circuits.

Unit V: Natural Resources

• Our environment: Eco-system, Environmental problems, Ozone depletion, waste production and their solutions.
• Biodegradable and non-biodegradable substances.

CollegeDekho: Can you give some tips for the preparation of the upcoming CBSE Class 10 Science 2026 exam?
Expert: Concentrate on units with high grades, such as World of Living, Chemical Substances, and Nature & Behaviour. To quickly review key ideas, formulas, and procedures, prepare brief notes, flowcharts, and labelled diagrams. To improve conceptual comprehension, solve experiments, numerical problems, and application-based questions regularly. To learn about the exam format, frequently requested questions, and time management, try past years' question papers and sample papers. Assign study time based on chapter weighting, prioritising units with higher grade points and striking a balance between theoretical and practical preparation. To increase confidence and recall, review key reactions, derivations, and useful techniques several times.

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