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Assertion (A): In our actions… (Class 10 Science 2025, Q18)

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ScienceCBSE Class 10 · Board exam 2025, set 31/3/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2025: question 18

Set in the CBSE Class 10 board exam of 2025, paper 31/3/1, section A, question 18, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q18 · 1 mark · Assertion-reasonCompetency-basedControl and Coordination

Assertion (A): In our actions of writing or talking, our nervous system communicates with the muscles.

Reason (R): Cranial nerves and spinal nerves form the peripheral nervous system.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/3/1.

Hints

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

Hint 1

Check each statement separately.

Hint 2

Does R explain why A happens?

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. Both statements are true. Voluntary actions like writing or talking involve the nervous system signalling the muscles, and the peripheral nervous system does consist of cranial and spinal nerves.

    ½ mark

  2. However, R only describes how the nervous system is organised. It does not explain the communication described in A.

    ½ mark

Answer: Option (B)

Where the marks are

  • Both true, R not the explanation (1 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 paper2025 board paper, set 31/3/1: 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.