Which of the following is the respiratory pigment in molluscs?

Haemoglobin

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Haemocyanin in the blood cells

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Myoglobin

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Haemocyanin in the blood plasma

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Solution

The correct option is D Haemocyanin in the blood plasma
Hemocyanins contains two copper ions as the main component which occurs in the blood of the large crustaceans and gastropods and cephalopod of molluscs. Hemocyanins are colourless in the reduced or deoxygenated state and blue when exposed to the air or oxygen dissolved in the blood.
Thus, the correct answer is option A.

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