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Class 10 Science Diagrams — Chapter-wise List

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Class 10 Science Diagrams — The Chapter-wise List (2026-27)

Every labelled diagram in the Class 10 Science syllabus, chapter by chapter. Use it as a checklist: if you cannot draw and label a diagram from memory in about two minutes, that one is not finished. Diagrams marked Practical also come up in the lab exam, so you must be able to draw and label them, not just recognise them.

Based on the current NCERT Class 10 Science book (13 chapters) · Last updated 24 September 2026

One honest caveat. CBSE does not publish an official list of which diagrams appear in the paper. This page lists the labelled diagrams that appear in the chapters of the current 13-chapter syllabus — the ones you are expected to understand and reproduce. Whether a particular diagram is asked in a particular paper is decided by CBSE, so prepare all of them rather than guessing.
Chemistry 1–4 Biology 5–8 Physics 9–12 Environment 13 How to score

Unit I — Chemistry (Chapters 1–4)

  • Ch 1 · Chemical Reactions and Equations — no labelled diagram required; practise the reactions and balanced equations instead.
  • Ch 2 · Acids, Bases and Salts — the pH scale with acidic, neutral and basic ranges marked.
  • Ch 3 · Metals and Non-metals — electron-dot (Lewis) structures of ionic compounds such as sodium oxide, magnesium chloride and calcium oxide; a labelled electrolytic cell for the extraction diagram if your book shows one.
  • Ch 4 · Carbon and its Compounds — electron-dot structures of simple molecules (H2, Cl2, O2, N2, CH4, C2H6, C2H4, C2H2, H2O, NH3, CH3OH, CH3COOH) and the functional-group structures.

Unit II — Biology (Chapters 5–8)

  • Ch 5 · Life Processes — nutrition in Amoeba (stages) · human digestive system · stomata with guard cellsPractical · cross-section of a leaf · villi · human respiratory system · human heart with chambers and major vessels · human excretory system and the nephron.
  • Ch 6 · Control and Coordination — neuron · reflex arc · synapse · human brain with the cerebrum, cerebellum and medulla labelled.
  • Ch 7 · How do Organisms Reproduce? — binary fission in AmoebaPractical · budding in yeast and HydraPractical · spore formation in Rhizopus · regeneration in Planaria · parts of a flower · germination of pollen on the stigma · human male and female reproductive systems.
  • Ch 8 · Heredity — Mendel’s monohybrid cross and dihybrid cross (Punnett squares) · sex determination in humans (XX / XY). Evolution diagrams such as the fossil or evolutionary-tree figures are reference material, not exam content for 2026-27.

Units III & IV — Physics (Chapters 9–12)

  • Ch 9 · Light — Reflection and Refraction — ray diagrams for image formation by a concave mirror and a convex mirror (all object positions) · ray diagrams for a convex lens and a concave lens · a labelled diagram of a spherical mirror and a lens showing pole, centre of curvature, principal axis and principal focus · the sign-convention figure · refraction through a rectangular glass slabPractical showing the incident, refracted and emergent rays and the angles.
  • Ch 10 · The Human Eye and the Colourful World — labelled human eye · myopia and hypermetropia with their correction diagrams · refraction of light through a prismPractical · dispersion of white light by a prism · a scattering / Tyndall effect diagram. The sunrise–sunset colour diagram has been excluded from the syllabus.
  • Ch 11 · Electricity — circuit diagrams with the correct symbols (a series circuit, a parallel circuit, an Ohm’s-law circuit with ammeter and voltmeter) · the V–I graph for a resistor · the domestic wiring circuit with live, neutral and earth wires.
  • Ch 12 · Magnetic Effects of Electric Current — magnetic field lines around a bar magnet · field due to a straight current-carrying conductor · field due to a circular loop · field due to a solenoid · the right-hand thumb rule and Fleming’s left-hand rule diagrams. Motor, electromagnetic induction and generator diagrams are reference material for 2026-27.

Unit V — Our Environment (Chapter 13)

  • Ch 13 · Our Environment — a food chain and a food web · the energy flow / trophic-level diagram showing the ten-percent transfer · an ozone-layer depletion diagram.

How to score full marks on a diagram

  • Label every part with a straight line — no arrows onto the wrong part, no labels floating in the margin.
  • Use a sharp pencil and a ruler. Draw the outline first, then add labels; never draw labels freehand in pen.
  • Write the direction of rays with arrowheads in every ray diagram. A ray without an arrowhead loses the mark even if the path is correct.
  • Match the label to the word in the textbook — for example write principal focus, not “focus point”.
  • Never write “not to scale” on a ray diagram. Ray diagrams carry their meaning in the geometry; draw the object and image on the correct side and at the correct relative height.
  • Practise on blank paper, from memory. Copying a diagram once teaches you nothing; redrawing it from memory three times fixes it.
Schematic vs real diagram. In a ray diagram, the geometry matters — get the rays right and the answer follows. In a labelled biological drawing (heart, nephron, neuron), the shape is approximate but the labels must be exact. Treat the two types differently when you revise.

Keep going

Prepared by Pandey Sir · Pandey Sir’s BEST Classes, Dammaiguda, Hyderabad. Diagram lists are checked against the current NCERT textbook and CBSE Class 10 Science syllabus; deleted and reference-only topics are marked so you do not waste time.

Sources: CBSE curriculum 2026-27 · NCERT textbooks

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