Question

Voice box of birds is
A. Larynx
B. Syrinx
C. Pharynx
D. Synaptine

Answer 1

Hint: Birds are warm blooded vertebrates that are specialized to fly and are characterized by the presence of wings, beak, toothless jaws etc. The wings in birds are modified forelimbs which bear the ability to fly. They are social and communicate with the visual signals as well as through their calls and songs.

Complete answer:
The important and characteristic features of birds include their songs and calls. The bird calls and bird songs are included in the bird vocalization. The calls of birds are a simple type of vocalization. While the song of birds are included in complex vocalization. The bird songs are more harmonious and melodious. The songs are used and are associated with courtships mating.
The vocal box of the birds is known as the syrinx. It is situated at the junction of the division of the windpipe. It is also called the lower larynx. The syrinx is a bony structure that is situated at the bottom of the trachea. An air space is also found surrounding the syrinx. The syrinx along with the air sac resonates to the sound waves. The sound waves are created by the membranes through which the bird forces air.
The syrinx is a double-barreled structure and each half is in the same position as that of the other half. Each part of the syrinx consists of a pair of organs that are present opposite to each other on the wall of the bronchus.
When the bird forces air along the bronchial tube, the syrinx is adjusted which changes the diameter of the tympanum and it protrudes inside the bronchial tubes. As there is movement of air , an acoustic disturbance is created and causes the tympanum to vibrate as a result of which sound is created. The pitch as well as the amplitude or loudness of the song can be adjusted and modulated.
Larynx is a commonly occurring sound box situated in the top of the neck in humans and is involved in the breathing, sound production as well as protecting the trachea against food aspiration.
Pharynx is the portion of the throat which is situated behind the mouth and nasal cavity. It is found in humans above the esophagus and larynx. It is found in the vertebrates as well as in the invertebrates.

Therefore, the correct option is option B.

Note: The birds are warm blooded vertebrates and produce specific sounds and songs through voice vocalization. The vocalization in birds is a complex mechanism and the vocal organ or vocal box of the birds is the syrinx. It is a structure situated at the base of the windpipe and is bony in nature.