Biology - Breathing and Exchange of Gases Question with Solution | TestHub

The trachea is a straight tube extending up to the mid-thoracic cavity. It is supported by incomplete cartilaginous rings (C-shaped), not complete rings. These rings prevent the trachea from collapsing during inspiration.

The pharynx (specifically the oropharynx) serves as a common passage for both food and air.

Tonsils are secondary lymphoid organs that help in fighting infections.

The epiglottis is a cartilaginous flap that covers the glottis to prevent the entry of food into the larynx and trachea during swallowing.

Therefore, the statement claiming that the trachea is lined by complete cartilage rings is incorrect.

Answer: Trachea is lined by complete cartilage rings