2001 AIPMT Animal KingdomRespiratory Pigments Hard Question 118 of 123 in Animal Kingdom

In which of the following haemocyanin pigment is found : -

A Annelida
B Echinodermata
C Insecta
D Lower chordata

The answer is A.

Solution

Haemocyanin is a copper-containing respiratory pigment that turns blue when oxygenated. It occurs mainly in molluscs and many arthropods (crustaceans, arachnids).
Annelids mostly have haemoglobin or chlorocruorin (green), dissolved in the plasma; some annelids have other pigments.
As per the answer key, haemocyanin is linked here to Annelida.
(This is doubtful: none of the four options is the usual textbook answer, which is Mollusca or Crustacea.)
So, as per the answer key, the answer is Annelida.

Concept Distribution of respiratory pigments

Animal Kingdom in past papers

123 questions from this chapter have appeared across 27 exam years.