Question

The respiratory pigment of molluscs is

• A. Haemoglobin
• B. Haemozoin
• C. Haemocyanin
• D. All the above

Answer 1

Answer: (C)

Haemocyanin

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. Hemocyanins are copper-containing respiratory pigments found in many mollusks (some bivalves, many gastropods, and cephalopods) and arthropods (many crustaceans, some arachnids, and the horseshoe crab, Limulus). This is the pigment which is present in the plasma and help in exchange of gases.

So, the correct answer (C)