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Assertion (A): In human… (Class 10 Science 2026, Q9)

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ScienceCBSE Class 10 · Board exam 2026, set 31/1/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2026: question 9

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, section A, question 9, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q9 · 1 mark · Assertion-reasonCompetency-basedLife Processes

Assertion (A): In human beings, the respiratory pigment is haemoglobin present in red blood cells.
Reason (R): Haemoglobin has a very high affinity for carbon dioxide.

  1. (A)Both, Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. (B)Both, Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the 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 2026 board paper, set 31/1/1.

Hints

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

Hint 1

Which gas does haemoglobin mainly carry from the lungs to the tissues?

Hint 2

How is most carbon dioxide transported in blood?

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. Assertion: haemoglobin in red blood cells is the respiratory pigment in humans. True.

  2. Reason: haemoglobin has a very high affinity for oxygen, not carbon dioxide. Most travels dissolved in plasma. So R is false. Correct option: (C).

    1 mark

Answer: (C)

Where the marks are

  • A true, R false, option (C) (1 mark)

Revise the chapter

  • Chapter: Life Processes (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Life Processes, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/1/1: 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.