Which is absent in blood of Cockroach ?

Plasma

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Respiratory pigment

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Nurtients

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Blood cells

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Solution

The correct option is B Respiratory pigment
The cockroach has an open vascular system consisting of sinuses filled with blood. The blood of cockroach is without haemoglobin or any other respiratory pigment. This type of blood devoid of any respiratory pigment is called haemolymph.
So, the correct answer is 'Respiratory pigment'.

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