Question

Which one of the following is not true about Aves?

• A. They are homeothermic animals
• B. In addition to lungs, they have air sacs for respiration
• C. They possess long pneumatic bones and fully ossified endoskeleton
• D. Skin is moist with the presence of oil glands throughout the entire body

Answer 1

The correct option is D Skin is moist with the presence of oil glands throughout the entire body

Birds are warm blooded (homeothermic) animals as they are able to maintain constant body temperature.

They have air sacs associated with lungs which help in the process of respiration.

Pneumatic (hollow) bones help in reducing body weight and aid in flight.

Aves lack glands in the skin and hence, their skin is dry. Although, in most birds, at the base of the tail, there is an oil gland called the "uropygeal gland" or the "preen gland". It helps in making the feathers waterproof and maintaining their integrity.