Respiratory pigment is absent in__________.

Earthworm

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Frog

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Rabbit

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Cockroach

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Solution

The correct option is D Cockroach
Insects do not use respiratory pigments to transport oxygen, rather they have branching tubes called trachae that suck in air. These carry oxygen straight to the tissues. Insect blood is not important for circulation of respiratory gases. Hence they do not have a respiratory pigment.

So, the correct answer is 'Cockroach'.

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