Question

Pneumatic bones occur in
(a) Whale
(b) Dolphin
(c) Peacock/pigeon
(d) Snake

Answer 1

Pneumatic bones are those bones which contain an air-filled cavity within them. Birds are known to have several flight adaptations. In correlation with their aerial life, the bones have become light and spongy. Most of them have air spaces inside. Several modifications are found in birds to reduce body weight, including the pneumatization of bones. Such bones are called pneumatic bones. They also form a part of the respiratory system in birds. They are known to help involved in their respiration during flight.

Complete step by step answer:
Pneumatic bones occur in peacock/pigeon. Pneumatic bones are those filled with air cells rather than tissues. They serve as a flight adaptation in birds. They have an air- filled cavity within them. They are hollow bones that contain many air cells, such as the mastoid process of the temporal bone. They even act as a part of the bird's respiratory system. The cavity inside pneumatic bones opens externally by an apparatus called pneumatic foramina. The bones of birds are lighter in weight than those of mammals. Hence the pneumatic bones in birds help to reduce body weight and helps in flight. The hollow spaces filled with air provide structural rigidity to the bird. Hence they help in the respiration of birds during flight. There is also a tendency for reduction and fusion of bones in some regions. The fusion of bones gives rigidity to enable the bones to cut through the air.

Additional information:
- Birds are warm-blooded, oviparous, bipedal, feathered, winged, and toothless vertebrates.
- They are extremely specialized and constructed for their arial life with great powers for flight.
- Their Fore-limbs are modified into wings for flight.
- Digits are only three in the fore- limb and never more than four in the hind- limb.
, the answer is ‘peacock/pigeon'.

Note:
- Pneumatic bones are also present in humans. Pneumatic bones can be found around your inner eyebrow, under your eyes, around the nose, and around your lower cheeks, essentially they are your sinus.
- They are seen in relation to the nasal cavity they enclose the paranasal sinuses. Pneumatic bones are; maxilla, frontal bone, sphenoid, and ethmoid.
- Pneumatic bones Include the skull, humerus, clavicle, keel, pelvic girdle, and lumbar and sacral vertebrae.