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In Arthropoda, respiratory pigment is
A Haemoglobin B Haemocyanin C Hemoerythrin D All of the above

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Correct option is B)
Hemocyanin is the protein which is involved in the transport of oxygen. This is the respiratory pigment which is present in the arthropods. These are known as metalloproteins because they contain two copper atoms. This atoms can bind to an oxygen molecule. In vertebrates, haemoglobin is the respiratory pigment. This is the iron-containing protein which is involved in the transport of oxygen. It is present in the red blood cells of all vertebrates. Hemoerythrin is responsible for oxygen transport in marine invertebrates.
Thus, the correct answer is option B.
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