Respiration in insects Is called direct because

Options

A. the cells exchange `O_(2)//CO_(2)` directly with the air in the tubes
B. the tissues exchange `O_(2)//CO_(2)` directly with coelomic fluid
C. the tissues exchange `O_(2)//CO_(2)` directly with the air outside through body surface
D. tracheal tubes exchange `O_(2)//CO_(2)` directly with the haemocoel which then exchange with tissues

Answer

a

Explanation

Insects have a network of tube (tracheal tubes) to transport atmospheric air within the body. There openings lead to trachae. The cells exchangae `O_(2)//CO_(2)` directly with the air in the spiracles present on insects body.