Question

Large and well developed sternum with keel, in a bird suggest

A.Inability to fly
B.Fast running adaptation
C.Strong flying ability
D.Fast swimming adaptation

Answer 1

Keel, the extension of bone from a bird's sternum under which the strong muscles of flight are connected. The powerful pectoral muscles needed for flight are anchored by Keel.

Complete answer:
First we should know about flightless birds to answer this question. The birds that lose their ability to fly together with flight muscles by adaptation as they adjust to the changing world become flightless birds. They are also identified as ratites.
Now, let us find the solution from the options-
- The most important mode of locomotion in birds in the real world is flight. The energy cost needed for the flight increases proportionally with the size of the body.
- The sternum is among the larger bones in the skeleton of the bird
-It is a component of the pectoral girdle that holds a broad keel liable for anchoring flight muscles.
- A large and also well sternum with a keel, suggesting the production of good bird flying ability.

Hence, the correct answer is option (C)

Note: The wings muscles should be attached to its keel for any bird to fly, as these act as driven springs linked to wings bone that for the flutter in turn are hedged to thoracic bones. In the context of birds, the wishbone or furcula is liable for stringing the thoracic cavity.