Q1. [1] § 5.4 TRANSPORTATION
Assertion (A) : Blood plasma transports carbon dioxide in dissolved form, while oxygen is transported by respiratory pigments.
Reason (R) : Carbon dioxide is more soluble in water than in oxygen.
- (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- (C) Assertion (A) is true, but Reason (R) is false.
- (D) Assertion (A) is false, but Reason (R) is true.
Previously asked in CBSE board exam
2026 31/2/1 Q8
Generated by claude-sonnet-4-6 · 2026-06-11 09:52 · grounding rag
Model Answer
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Plasma transports CO₂ in dissolved form because CO₂ is more soluble in water than O₂, so O₂ must be carried by haemoglobin in RBCs.
Explanation
The textbook states: "Plasma transports food, carbon dioxide and nitrogenous wastes in dissolved form. Oxygen is carried by the red blood corpuscles." The reason CO₂ can dissolve in plasma (water-based) while O₂ cannot is directly explained by the greater solubility of CO₂ in water — making R the correct explanation of A. Choose option (A).
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