Q.

Which one of the following is the respiratory pigment in man?

A. Haernocyanin
B. Haemoerythrin
C. b-Carotene
D. Haemoglobin
Answer» D. Haemoglobin
Explanation: A respiratory pigment is a molecule, such as hemoglobin in humans, which increases the oxygencarrying capacity of the blood. The four most common invertebrate respiratory pigments are hemoglobin, haemocyanin, haemerythrin and chlorocruorin.
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