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Question

Birds have
One right aortic arch
One left aortic arch
One poorly developed and other fully developed
Both are fully developed

A

One left aortic arch

B

One right aortic arch

C

One poorly developed and other fully developed

D

Both are fully developed

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Solution

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The correct option is A One right aortic arch
Systematic arch is the fourth aortic arch of vertebrates which is the principal source of the blood supply to the body. In amphibians and reptiles, both left and right aortic arches are present. Adult birds only have one right aortic arch while adult mammals only have left one. Hence, option A is correct.

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