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Question

Pigment haemocyanin is found in

A
Chordata
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B
Annelida
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C
Porifera
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D
Mollusca
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Solution

The correct option is C Mollusca
Hemocyanins are proteins that transport oxygen throughout the bodies of some invertebrate animals, like molluscs and arthorpods. These metalloproteins contain two copper atoms, that reversibly bind a single oxygen molecule. They are second only to hemoglobin in frequency of use as an oxygen transport molecule. Hence, option D is correct.

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