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Sunil unconsciously touched… (Class 10 Science 2026, Q12B)

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ScienceCBSE Class 10 · Board exam 2026, set 31/4/1 · 2 marks · Very short answer

CBSE Class 10 Science 2026: question 12(B)

Set in the CBSE Class 10 board exam of 2026, paper 31/4/1, section A, question 12(B), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q12(B) · 2 marks · Very short answerCompetency-basedControl and Coordination

Sunil unconsciously touched the hot iron rod and immediately withdrew his hand. Which type of action is involved? Also define this action. Draw a flow chart to show the path followed for this action.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/4/1.

Hints

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

Hint 1

The hand moved before Sunil had time to think. What kind of action is that?

Hint 2

The reflex arc passes through the spinal cord. List the neurons in the order the message travels.

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. The action involved is a reflex action.

    ½ mark

  2. Definition: A reflex action is a sudden, automatic and quick response to a stimulus that happens without conscious thinking. It is controlled by the spinal cord.

    ½ mark

  3. Flow chart (reflex arc): Stimulus (heat of the rod) → Receptor (in the skin) → Sensory neuron → Relay neuron (in the spinal cord) → Motor neuron → Effector (arm muscle) → Response (hand withdrawn).

    1 mark

Answer: Reflex action: a quick, automatic response to a stimulus without thinking. Path: Stimulus → Receptor → Sensory neuron → Relay neuron (spinal cord) → Motor neuron → Effector (muscle) → Response.

Where the marks are

  • Names the action as a reflex action (½ mark)
  • Defines it as an automatic, quick response without thinking (½ mark)
  • Draws the correct flow chart of the reflex arc (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 paper2026 board paper, set 31/4/1: 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.