Question

Blood of Cockroach does not contain respiratory pigment. It means Cockroach

• A. Does not respire
• B. Respires anaerobically
• C. Oxygen goes to tissues by intracellular capillary system
• D. Oxygen reaches tissues directly through diffusion

Answer 1

Answer: (D)

Oxygen reaches tissues directly through diffusion

Haemoglobin is absent in cockroach,the respiratory system consists of a network of trachea, that open through 10 pairs of small holes called spiracles present on the lateral side of the body. Thin branching tubes carry oxygen from the air to all the parts. The opening of the spiracles is regulated by the sphincters. Exchange of gases takes place at the tracheoles by diffusion.

So the correct answer is 'Oxygen reaches tissues directly through diffusion'.