Question

Hollow bones of birds:

• A. Increase the respiratory rate
• B. Increase the heartbeat rate
• C. Increase the $C{O}_2$ output
• D. Increase the buoyancy

Answer 1

Answer: (D)

Increase the buoyancy

• Birds have hollow bones that contain air cells, which leads to increasing their buoyancy and helps them in flight. These hollow bones are called pneumatic bones.
• Buoyancy is the ability of a body to float or rise in a fluid (liquid or gas). Since birds have hollow bones and feathers, they trap air in them and increase the buoyancy of the bird, helping them to float easily on air.

So, the correct answer is option D.