Question

Which of the following statements is incorrect pertaining to cockroach.

• A. Ostia have valves which allow blood to pass only into heart
• B. Thoracic and abdominal spiracles are valvular
• C. Wall of trachea is made with lamina propria, endothelium and taenidia
• D. The taenidia keep the trachea always open and prevent it from collapsing

Answer 1

Answer: (C)

Wall of trachea is made with lamina propria, endothelium and taenidia

The wall of the tracheae is made of three layers. They are an outer basement membrane, a middle one cell thick epithelium and an inner layer of cuticle called intima. The intima is produced into spiral thickenings called taenidia. The taenidia keep the tracheae always open and prevent it from collapsing.

So the correct answer is 'Wall of the trachea is made with lamina propria, endothelium, and taenidia'.