Two students who know the same concept can score very different marks depending on how they write their answers. CBSE Science examiners are trained to check for specific structures, keywords, and diagrams. Writing well is a skill — and it can be learned.
The Format for Each Question Type
| Marks | Format | Example |
|---|---|---|
| 1 mark | One sentence with the key term | 'Photosynthesis is the process by which plants prepare food using sunlight.' |
| 2 marks | Definition + one example OR two distinct points | Define osmosis + give one real-life example |
| 3 marks | Three numbered points OR diagram + two points | Diagram of nephron + two functions of kidney |
| 5 marks | Introduction + 3–4 points + labelled diagram + conclusion | Full explanation of refraction with ray diagram |
Keywords That Examiners Look For
CBSE Science marking schemes are built around specific NCERT keywords. If you use these keywords, you get the marks. If you paraphrase — even correctly — you may not. The safest approach: read NCERT definitions until you can write them from memory, word for word.
- Use NCERT's exact definition language — 'Respiration is the process of breakdown of food in the cell with the release of energy' is what earns the mark.
- For process questions, use sequence words: 'First...', 'Then...', 'Finally...' — this shows logical flow.
- For comparison questions, use a table format — examiners reward clear, structured comparisons.
- For numerical answers, always: write the formula → substitute values with units → solve → write the answer with units.
Tip
Buy a CBSE Science sample paper booklet and read the model answers — not to memorise, but to understand the level of detail expected. Most students write too little for 3-mark and 5-mark questions.
The Diagram Rule
A question that says 'with the help of a diagram' or 'draw a labelled diagram' awards 1 separate mark for the diagram itself. Never skip a diagram even if you're unsure about labels — an unlabelled but accurate diagram still gets partial credit. An absent diagram gets zero for that component.
Common Answer-Writing Mistakes to Stop Now
- Writing paragraphs for 3-mark questions — use numbered points, not prose.
- Not underlining or highlighting key terms in your answer — it helps the examiner spot keywords fast.
- Leaving diagram unlabelled — labels are often worth half the diagram marks.
- Writing the answer in pencil — always write in blue or black ink; pencil is only for diagrams.