Question

Respiration in insects is called direct because

• A. The cells exchange $O_{2}/CO_{2}$directly with the air in the tubes
• B. Tracheal tubes exchange $O_{2}/CO_{2}$ directly with the haemocoel which then exchange with tissues.
• C. The tissues exchange $O_{2}/CO_{2}$ directly with coelomic fluid
• D. The tissues exchange $O_{2}/CO_{2}$ directly with the air outside through body surface

Answer 1

Answer: (B)

Tracheal tubes exchange $O_{2}/CO_{2}$ directly with the haemocoel which then exchange with tissues.