Paper 1 · People, Development and Environment
Assertion (A): Carbon monoxide is a serious asphyxiant; even a short exposure may have fatal health effects. Reason (R): Haemoglobin present in the blood has a greater affinity towards carbon monoxide than oxygen. Choose the correct answer.
ABoth (A) and (R) are true and (R) is the correct explanation of (A) ✓ Correct
BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
C(A) is true, but (R) is false
D(A) is false, but (R) is true
Correct answer: (A) Both (A) and (R) are true and (R) is the correct explanation of (A) — Both (A) and (R) are true, and (R) correctly explains (A), so that is the answer.
Explanation
★Both (A) and (R) are true, and (R) correctly explains (A), so that is the answer.
★The assertion says carbon monoxide is a dangerous asphyxiant, harmful even briefly.
★The reason says haemoglobin binds carbon monoxide more strongly than oxygen.
★This strong binding keeps oxygen from reaching the body, which is why it asphyxiates.
★So the reason explains why carbon monoxide is so dangerous.
★So both are true and (R) is the correct explanation of (A).
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