Question

In the cockroach, $O_2$ is carried to tissue by:

• A. Haemoglobin and haemocyanin
• B. Blood plasma
• C. Tracheal tubes
• D. Diffusion through integument

Answer 1

The correct option is C Tracheal tubes

The respiratory system of cockroaches is well developed and comprises of - tracheae or tracheal tubes, tracheoles, and spiracles.

The branches of the tracheal tubes penetrate all the body parts. The finest branches of the air tubes are referred to as the tracheoles.

The tracheal tubes communicate with the exterior through 10 pairs of apertures that are segmentally arranged on the body surface of cockroaches. These are called - Spiracles.

Thus, the correct answer is option C.