Students write a paragraph for two marks and three lines for five, and lose in both directions on the same paper.
Updated 28 October 2026 · Great Home Tutor · Delhi, Noida and Gurgaon
The useful question is not how long an answer should be but how many separate points it needs. Work roughly one substantive point to each mark, and add the diagram, equation or calculation where the question invites it. A five-mark answer is not a longer paragraph; it is a structured answer with distinct parts the examiner can tick.
| Applies to | Class 10 Science, CBSE |
|---|---|
| Principle | Points, not length |
| Usual loss | Over-writing short answers, under-structuring long ones |
| Authority | The current year sample paper, not a guide book |
| Enquiries | +91 92121 42427 |
The real question is not how long, it is how many points
Ask most Class 10 students how much to write for a three-mark question and you get an answer in lines. That is the wrong unit, and it is why the same child writes too much in one place and too little in another on a single paper.
Marks in a science paper are awarded against specific content. If a question is worth three, the examiner is looking for roughly three distinct creditable things, and a fourth sentence saying the same thing in other words adds nothing except the time it took to write. Conversely, a five-mark answer written as one flowing paragraph may contain everything required and still be hard to award, because the examiner is reading for separable parts and the student has fused them.
Once a child starts counting points rather than lines, both errors correct themselves, and the paper gets finished on time as a side effect.
Two and three mark answers: the shape
These are the most common questions in the paper and the ones students most often over-write. The shape is short: state the thing asked for, then give the reason or the consequence, and stop.
A useful instruction is that a two-mark answer should almost never need more than three sentences, and that the child should be able to point at which sentence carries which mark. If they cannot, the answer is padded. Where the question asks for a difference between two things, write it as two parallel statements rather than a paragraph about the first followed by a paragraph about the second; the parallel form makes the contrast visible and takes less time.
Five mark answers: a structure with parts
Long answers in Class 10 science generally reward a visible structure. Something like a short definition or statement of the principle, the explanation itself broken into steps, and then the diagram or equation or example that the question asked for or plainly invites.
- Use the parts of the question as the parts of the answer. Long questions are often two or three questions joined together. Answering them in the order asked, with a break between, makes every part findable.
- Number or space the points. Not decoratively, but so that distinct ideas sit apart. An examiner should not have to search a paragraph for the third point.
- Do not save the diagram for the end as an afterthought. Put it where it belongs in the explanation, labelled, in pencil, at a sensible size.
Diagrams, equations and numericals are marks, not decoration
Students treat these three as optional garnish on a written answer. In this paper they are frequently where a mark is specifically allocated.
A diagram earns its mark when it is labelled; an unlabelled sketch is usually worth nothing however accurate. A chemical equation earns its mark when it is balanced and shows the condition where the reaction needs one. A numerical earns its marks across the formula, the substitution and the final answer with its unit, which means a student who writes only the number has thrown away most of the question even when the number is correct.
The related habit worth naming: when a question says to draw and explain, both verbs are being marked. Students routinely do one of the two well and assume the other was covered.
The thing most parents get wrong here. Encouraging a child to write more when marks are low. It is the intuitive response and it usually makes things worse, because the child slows down, does not finish the paper, and still misses the point the examiner wanted. The fix is almost always the opposite: fewer words, arranged so each mark is easy to find.
Time, and why a long answer to a short question costs twice
Writing six lines for a two-mark question costs the two minutes spent and then costs again at the end of the paper, when the long questions are met with no time left. Students who come out saying they knew everything but could not finish are almost always describing this, not a shortage of preparation.
The correction is done in practice rather than in advice. Give the child a mixed set with the marks written next to each question and a clock, and require them to stop when the points are made. A fortnight of that changes the pacing more than any amount of being told to write faster.
Practise on the right paper
The question types and their weights are set out each year in the board's own sample paper for that session, and the child's teacher will be working from it. That is the document to practise against. A guide book printed for an earlier pattern will drill a shape of answer that may no longer be asked for, which is worse than no practice because it feels like preparation.
We teach one to one at home across Delhi, Noida and Gurgaon, and live online anywhere. In Dwarka this is the work most of our Class 10 science sessions turn into after the pre-boards: not new content, but sitting with the child's own returned paper and rewriting three or four answers properly, which is generally worth more at that stage than another chapter.
Questions parents ask
My child writes a great deal and still scores poorly. What is happening?
Usually the writing is repetition rather than additional points. A long answer that says one thing four ways earns one mark. Have someone mark an answer against the points rather than by impression, and the pattern shows immediately.
Should diagrams be drawn in pen or pencil?
Pencil for the diagram, with labels that are clearly readable. What matters far more than the medium is that it is labelled, large enough to read, and placed where the explanation refers to it.
How do we practise this at home?
Take a returned test, pick the three answers that lost most marks, and have the child rewrite them with the marks visible and a point per mark. Rewriting three answers properly teaches more than attempting a fresh paper.
Is it worth learning answers from a guide book?
Memorised model answers help less than families expect, because the question in the paper is rarely phrased the same way and a memorised answer fitted to a different question loses marks. Learn the points; compose the answer on the day.
Does neat handwriting earn marks?
Not directly, but illegible work can lose them, because a mark cannot be awarded for something that cannot be read. Legible and well spaced is the standard worth aiming at; beautiful is not required.
Does this apply to ICSE as well?
The principle does, but the paper is structured differently and the science subjects are examined separately, so the practice should be done on ICSE papers. Do not transfer answer-length habits between the two boards.
When should this start, rather than more chapter teaching?
By the time the pre-boards are returned, at the latest. Before that, a session or two on answer structure alongside the teaching is enough. What does not work is leaving it until March, when the habit has had a year to set.
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