Question

Syrinx is present in the region of
(a) Origin of the trachea
(b) Middle of the trachea
(c) End of the trachea
(d) End of bronchi

Answer 1

Hint: Syrinx is a part of the respiratory system of the birds. It is the vocal organ of birds that is buried deep inside its chest. It is located at a region of the windpipe where the windpipe splits into bronchi which connects the trachea to the lungs.

Complete answer:
Mammals, Birds, and Reptiles have a larynx which is a hollow, muscular organ at the top of the trachea that helps air to pass and enter into the lungs and also prevents food from entering the respiratory tract. In Mammals and Reptiles, the larynx has small folds of tissues called vocal cords(vocal folds). These folds vibrate when air passes through them thus producing sound.
In Birds, the larynx is only present for eating and breathing. It cannot produce sound. These vocal folds are replaced by a unique organ called Syrinx. Syrinx is located at the caudal end of the trachea and at the beginning of the primary bronchi. It is surrounded by an air sac. At syrinx, the trachea of birds divides into two primary bronchi. When air passes through the syrinx, the membranes present inside it vibrate thus producing sound. Some birds can mimic human speech only because of Syrinx.

Additional information: Syrinx is unique to birds. No other organism on this planet has Syrinx.
It has two types of cartilages: Tracheal and Bronchial.
The tracheal cartilages are complete and sturdy whereas the bronchial cartilages are incomplete.
The position, shape, and size of the syrinx are different in different species.
Songbirds and some other birds are able to control the right and left halves of the syrinx separately thus singing with two independent voices.
So, the correct answer is ‘End of trachea’.

Note: Syrinx in birds should not be confused with Syrinx in humans. In humans, the syrinx is a fluid filled cavity. If this cavity is present within the spinal cord it's called syringomyelia and if it's present within the brain stem then it's called syringobulbia.