Question

Syrinx is present in the region of

• A. Origin of trachea
• B. Middle of trachea
• C. End of trachea
• D. End of bronchi.

Answer 1

The correct option is C End of trachea

A) Birds have a syrinx at the base of the trachea.

B) The trachea of birds bifurcates into two primary bronchi at the syrinx. Hence, the syrinx is present at the base of the trachea.

C) Birds have a syrinx at the base of the trachea. The sound is produced by vibrations of the walls of the syrinx, caused by air flowing through the syrinx.

D) Birds do not have a pleural cavity as the lungs do not expand, so membranes are not necessary. One primary bronchus from the trachea enters each lung, narrowing as it travels through, and communicates with the abdominal air sac. Bronchi are absent.
So the correct answer is 'End of trachea'.