Which one of the following organisms bears hollow and pneumatic long bones?
- Ornithorhynchus
- Neophron
- Hemidactylus
- Macropus
Answer
(2) Neophron
Solution
As per NCERT, in birds (class Aves) the long bones are hollow with air cavities (pneumatic), an adaptation for flight.
Neophron (vulture) is a bird ⇒ it has hollow, pneumatic long bones.
Ornithorhynchus (platypus) and Macropus (kangaroo) are mammals and Hemidactylus (wall lizard) is a reptile; they do not have pneumatic bones.
Answer: (2)