The blood of cockroach contains no respiratory pigment. It means that
A. cockroach does not respire.
B. respiration is anaerobic.
C. oxygen goes directly into tissues by diffusion.
D. oxygen goes directly into tissues by intracellular capillary system.
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Correct Answer : D.
Without respiration, no animal can survive. Cockroach is not as simple as Hydra where oxygen can diffuse directly into the cells. There is a system of tubes in cockroach, the tracheal system, with the help of which oxygen goes directly into the tissues by intracellular capillary system.