Question

Book lungs occur in

• A. Earthworms
• B. Insects
• C. Arachnids
• D. Mammals

Answer 1

Answer: (C)

Arachnids

A. Earthworms- Respiration usually occurs through the skin( Cutaneous respiration). Some have gills (bronchial respiration).

B. Insects- Respiration occurs by tracheae. These communicate with the exterior by paired apertures, the spiracles, controlled by valves. The tracheae carry oxygen directly to the cells.

C. Arachnids- Respiration occurs by tracheae or book lungs or both.

D. Mammals- Respiration occurs only by lungs.

So, the correct answer is "Arachnids".