Question

Lungs without air sacs occur in

• A. Sparrow
• B. Peacock
• C. Penguin
• D. Falcon

Answer 1

Answer: (C)

Penguin

A) Air sacs are found as tiny sacs as extensions of the lungs in birds to increase respiratory efficiency by providing a large surface area for gas exchange. Sparrows have air sacs.

B) Peacocks have air sacs even though they do not fly to great heights.

C) Bird lungs are aided by air sacs that help to dissipate heat and reduce the density of their bodies for flying. Penguin is a flightless bird and so, it lacks air sacs.

D) Falcons have air sacs to help in respiration and flight.

So the correct answer is 'Penguin'.