Q 2061280125.     Respiration in insects is called direct because

NCERT Exemplar 17/01/M
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.

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