Question

In which of the following, haemocyanin pigment is found?

• A. Annelida
• B. Echinodermata
• C. Molluscs
• D. None of these

Answer 1

Answer: (C)

Molluscs

• Haemocyanin and hemoglobin are respiratory proteins found in animal’s blood.
  
• Haemocyanin contains copper while hemoglobin contains iron. Hence the blood of animals with hemocyanin has a blue color instead of red.
• Most molluscs and arthropods contain hemocyanin, such as the horseshoe crab and the giant octopus.
• Haemocyanin is better than hemoglobin in lower oxygen environments like the bottom of certain oceans/seas.
• Annelids have hemoglobin, hemerythrin and chlorocruorin as blood pigments while echinoderms often lack any pigments.
  

So the correct option is 'Molluscs'.