In which of the following animals, haemocyanin pigment is found? (a) Annelida (b) Echinodermata (c) Insecta (d) Mollusca
Option D In molluscs, blood often has a copper containing, blue respiratory pigment called haemocyanin. In insects, the blood called haemolymph is colourless. In echinodermates, blood is colourless as it has no respiratory pigment. In annelids, the blood is red with haemoglobin dissolved in plasma.
