Question

Respiratory pigment in Mollusca is

• A. Haemocyanin in plasma
• B. Haemoglobin in blood cells
• C. Myoglobin
• D. None of the above

Answer 1

The correct option is A Haemocyanin in plasma

Haemocyanin is the pigment found in the blood of molluscs, crustaceans and arthropods. The active centre of haemocyanin contains two molecules of copper which bind to the single oxygen molecule. The blue colour of this pigment is due to the presence of copper which is blue in colour. This is the pigment which is present in the plasma and help in exchange of gases.

Thus, the correct answer is option B.