Question

Sound box of birds is called as:
A. Pygostyle
B. Larynx
C. Syrinx
D. Synsacrum

Answer 1

Hint: The sound box is an organ which is responsible for producing sound in organisms. But is of different shape, size and structure in different animals or organisms. The sound box of birds is situated where windpipe and food pipe get divided.

Complete answer:
> Option A is Pygostyle - is a bone present in the structure of uropygium, which is commonly called as bishop’s nose, parson’s nose, pope’s nose or sultan’s nose. This is a shiny protuberance visible at the posterior end of the different birds. Pygostyle also has a gland called a uropygial gland responsible for production of preen oil in birds. So, from this discussion we can easily say that this is not the correct answer.

> Option B is larynx- It is a sound box or sound producing organ for humans. It is present in the upper portion of the neck. And Larynx helps with sound production, breathing and aspiration of food into the trachea. So, this organ is present in humans thus, this is also not the correct option for this question. Let's move to another option.

> Option C is Syrinx- This is the organ present in birds at the base of the bird's trachea. And it produced sound without involvement of vocal cords, which is generally present in mammals. This organ produces sound with the help of vibrations and modulation. When air flows through this organ, walls of syrinx produce vibrations. This system of producing sound is a self-oscillating system that modulates air to produce sound. Thus, we can say this option is correct. Syrinx is the sound producing organ in the birds.

> Option D is Synsacrum – It is a skeletal structure of birds, and some of dinosaurs in which sacrum is also present. Thus, this option is also not correct for this question.

Hence, The correct answer is, option (C).

Note: Please take the fact that larynx is the sound organ of humans and syrinx is the sound organ of birds. And Synsacrum is full of skeletal structure of birds.