Question

Wish bone is a bone found in birds
A. Elongated pelvic girdle
B. Keeled pectoral girdle
C. Product of fused clavicles
D. Knee bone

Answer 1

Hint: The warm blooded vertebrates of class Aves are birds. They have feathers. Birds have toothless beaked jaws. The wings of the birds are evolved from forelimbs that help them to fly. Birds are the only vertebrate animals to have fused collarbones.

Complete Answer:
- The furcula is a forked bone which is present in birds. The furcula is formed by fusion of two clavicles into a single structure.
- The furcula is also called a wishbone. It is a V shaped bone. It is present at the base of the neck in birds and even in some dinosaurs.
- The wishbone helps in the strengthening of the thoracic skeleton. The furcula acts as spring in the pectoral girdle during flight.
- The wishbone helps in storing some energy which is generated by contraction and then releases the energy during upstroke.
- There are many species where the furcula is completely absent such as in some owls, some parrots.
- In flyers like cranes the arms of the furcula are large and rigid. The furcula or wishbone also helps in respiration.

So the correct answer is Product of fused clavicles.

Note: The wishbone is attached to the shoulders. It may also be fused to the sternum. Wishbone protects the chest cavity during flight. It helps birds to maintain its body shape and structure intact even under great stress. The wishbone ensures that muscular contractions during flight do not break bird’s ribs.