Pigment haemocyanin occurs in

Echinodermata

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Mollusca

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Chordata

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Annelida

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Solution

The correct option is A Mollusca
Hemocyanin is respiratory pigment found only in the blood of Mollusca and Arthropoda. It is a copper-containing protein. Like haemoglobin, it transports oxygen to in the haemolymph. Hemocyanin is blue in colour when oxygenated and colourless when oxygen is removed.
Thus, the correct answer is option B.

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