Respiration in insects is called direct because:

The cells exchange O_{2} / C O_{2} directly with the air in the tubes

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The tissues exchange O_{2} / C O_{2} directly with coelomic fluid

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The tissues exchange O_{2} / C O_{2} directly with the air outside through body surface

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Tracheal tubes exchange O_{2} / C O_{2} directly with the haemocoel which then exchange with tissues

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Solution

The correct option is A $The cells exchange O_{2} / C O_{2} directly with the air in the tubes$
If the exchange of gases between the body cells and oxygen takes place directly, it is known as direct respiration. Insects have a network of tubes (tracheal tubes) to transport atmospheric air within the body. These openings lead to trachae. The cell exchange $O_{2} / C O_{2}$ directly with the air.

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Similar questions

Respiration in insects is called direct because

(a) the cells exchange $O_{2} / C O_{2}$ directly with the air in the tubes

(b) the tissues exchange $O_{2} / C O_{2}$ directly with the air in the tubes

(d) tracheal tubes exchange $O_{2} / C O_{2}$ directly with the haemocoel which then exchange with tissues

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