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MHT CET Medical202621 April 2026Evening ShiftBiologyBreathing and Exchange of GasesActual

Identify the INCORRECT statement:

Options

  1. AOropharynx is the common passage for food and air
  2. BTonsils are lymphoid organs
  3. CEpiglottis is a flap that prevents the entry of food into trachea
  4. DTrachea is lined by complete cartilage rings

Correct answer

D. Trachea is lined by complete cartilage rings

Step-by-step solution

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 swallow

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