Question

What is common between the trachea of rabbit and cockroach?

• A. Both start in head region
• B. Both are filled with fluid
• C. Wall in both is strengthened which does not allow to collapse
• D. None of the above

Answer 1

Answer: (C)

Wall in both is strengthened which does not allow to collapse

The tracheae are silvery white ectodermal epithelial tubes. Intima is the internal chitinous lining. It forms transverse spiral thickenings or ridges known as taenidia which strengthen the walls and prevent their collapse. The trachea of rabbit is prevented from collapsing by incomplete rings of cartilage.
Therefore, the correct answer is option C.