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Draw and explain how… (Class 10 Science SQP 2025-26, Q13)

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ScienceCBSE Class 10 · Sample paper, session 2025-26 · 3 marks · Short answer

CBSE Class 10 Science sample paper 2025-26: question 13

From the official CBSE sample question paper for 2025-26, section A, question 13, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q13 · 3 marks · Short answerControl and Coordination

Draw and explain how the nerve cells help in transmission of impulses?

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

Open one hint at a time and try again before the next.

Hint 1

Start with the parts of a neuron: where does information enter and where does it leave?

Hint 2

How does the signal jump the gap between two neurons?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Diagram (structure of a neuron): Draw a star-shaped cell body containing a nucleus, with branched dendrites around it. A long axon runs from the cell body and ends in branched nerve endings. Next to these, show the synapse, the gap between the nerve ending and the dendrite of the next neuron. Label all of these parts.

    1 mark

  2. Information from the environment is picked up at the dendrite tips of a nerve cell. This sets off a chemical reaction that creates an electrical impulse.

    1 mark

  3. The impulse travels from the dendrite to the cell body, then along the axon to its end. There it causes certain chemicals to be released.

    ½ mark

  4. These chemicals cross the synapse and start a similar electrical impulse in a dendrite of the next neuron, or in a muscle cell at a neuromuscular junction. This is how impulses are passed along in the body.

    ½ mark

Answer: Labelled neuron diagram; impulse path: dendrite → cell body → axon → nerve ending → chemicals released → cross synapse → impulse in next neuron.

Where the marks are

  • Correct labelled neuron diagram showing dendrite, cell body, nucleus, axon and nerve ending (1 mark)
  • Information at the dendrite converted into an electrical impulse by a chemical reaction (1 mark)
  • Impulse travels through cell body and axon, and chemicals are released at the axon end (½ mark)
  • Chemicals cross the synapse and start an impulse in the next neuron (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Control and Coordination, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2025-26: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.