Question Detail
Question
Which of the following respiratory parts of an insect is not cuticularized?
Correct Answer
Option B is the correct answer.
Detailed Explanation
The tracheal system in insects is lined with cuticle, which is shed during molting. However, the smallest branches, the tracheoles, are not cuticularized. They are thin-walled and fluid-filled, allowing for direct gas exchange with the tissues. Spiracles and stigmata are openings with cuticular valves.
Hint
Which part of the insect respiratory system is thin-walled and penetrates tissues for direct gas exchange?