The blood of cockroach contains no respiratory pigment. It means that

Respiration is anaerobic

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Cockroach does not respire

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Oxygen goes directly into tissues by diffusion

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Oxygen goes into tissue by intracellular capillary system

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Solution

The correct option is C Oxygen goes directly into tissues by diffusion
The insects have an open circulatory system, draw in air through external valves called spiracles and transport the air directly to the cells via tubes called trachea by diffusion. Therefore, the correct answer is C.

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