NEET 2001 Biology question

In which of the following haemocyanin pigment is found : -

(1)Annelida
(2)Echinodermata
(3)Insecta
(4)MolluscaCorrect

Answer: (4)

Solution

Haemocyanin is a copper-containing respiratory pigment, blue when oxygenated, dissolved directly in the haemolymph (not carried in cells). It is the characteristic respiratory pigment of molluscs (and some arthropods such as crustaceans and arachnids), so Mollusca is the correct choice (NCERT:

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Question ID VK-088855