Which of the following lacks respiratory pigment in blood?

Earthworm

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Cockroach

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Rat

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All of the above

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Solution

The correct option is B Cockroach
In the cockroach, the respiratory pigments like hemoglobin are absent. The blood contains no red blood cells to transport oxygen as its respiratory system is open and hence, their blood is colorless too.
Therefore, the correct answer is option B.

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Which of the following is the respiratory pigment present in the stroma of an RBC?

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