Consider the following statements about haemoglobin:
1. It carries oxygen in the blood.
2. It is an iron-containing compound.
3. It provides immunity against certain diseases.
4. It imparts red colour to the blood. The correct statements out of these are:
- A1, 2 and 3
- B1, 3 and 4
- C2, 3 and 4
- D1, 2 and 4
Show answer and explanation
Correct answer: (d) 1, 2 and 4
Explanation
Haemoglobin is an iron-containing protein in red blood cells that carries oxygen (statements 1 and 2 correct).
It imparts the red colour to blood, making statement 4 correct.
Immunity is provided by white blood cells (leukocytes) and antibodies, not haemoglobin, so statement 3 is wrong.