Question

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

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

Hint:

Oxygen binds to haemoglobin to form oxyhaemoglobin. While some \(CO_{2}\) can bind to it (carbaminohemoglobin), its primary high-affinity role is for Oxygen.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Haemoglobin is a protein in red blood cells that transports gases between the lungs and the tissues.
Step 2: Detailed Explanation:
- Assertion: True. Haemoglobin is indeed the respiratory pigment in humans that carries oxygen to all cells.
- Reason: False. Haemoglobin has a very high affinity for oxygen, not carbon dioxide. Most carbon dioxide is transported in the dissolved form in blood plasma or as bicarbonates because \(CO_{2}\) is more soluble in water than oxygen is.
Step 3: Final Answer:
The assertion is correct, but the reasoning is biologically incorrect regarding the affinity of haemoglobin.