NEET2026BiologyChapterActual
Identify the set of characteristics that correctly describes the members of Class Aves.
Options
- ADry skin devoid of any glands, pneumatic bones, and internal fertilization
- BPresence of feathers, pneumatic bones, and air sacs connected to lungs
- CForelimbs modified into wings, three-chambered heart, and homoiothermy
- DPresence of a beak, scales on hindlimbs, and indirect development
Correct answer
B. Presence of feathers, pneumatic bones, and air sacs connected to lungs
Step-by-step solution
Members of Class Aves (birds) are characterized by the presence of feathers, which is their most unique feature. Their endoskeleton is fully ossified (bony) and the long bones are hollow with air cavities, known as pneumatic bones, which help in reducing body weight for flight. Respiration is performed by lungs, and air sacs connected to the lungs supplement respiration. Other options are incorrect because: Skin in birds is dry without glands, except for the oil gland at the base of the tail. Birds possess a comple