Respiration in insects is called direct because
(a) The cells exchange O2 / CO2  directly with the air in the tubes
(b) The tissues exchange O2 / CO2  directly with coelomic fluid
(c) The tissues exchange O2 / CO2 directly with the air outside through body surface
(d) Tracheal tubes exchange O2 / CO2  directly with the haemocoel which then exchange with tissues

Answers (1)

The answer is the option (d) Tracheal tubes exchange O2 /CO2  directly with the haemocoel which then exchange with tissues
Explanation: - The process of respiration occurs directly because there exists no other medium for the transmission of the air; instead, the cells exchange oxygen and carbon dioxide with the air in the tubes.

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