The flap like structure that prevents the entry of food into the trachea is theGlottisEpiglottisUvulaTongue

The correct answer to the question is Epiglottis.

Explanation:

The epiglottis is a crucial flap-like structure in the human body that serves to prevent food and liquid from entering the trachea (the windpipe) during swallowing. It is situated at the base of the tongue and is made of elastic cartilage, which allows it to flap down over the opening of the larynx when swallowing occurs. This action ensures that food is directed into the esophagus and not the trachea, thereby preventing choking and aspiration.

The other structures mentioned:

• The glottis refers to the opening between the vocal cords in the larynx and does not have a protective role during swallowing.
• The uvula is a small fleshy structure that hangs from the soft palate, helping to prevent food from entering the nasal cavity.
• The tongue is primarily involved in manipulating food during chewing and assisting with swallowing but does not directly prevent food from entering the trachea.

In summary, the epiglottis plays a vital role in the respiratory and digestive systems, maintaining the separation of air and food pathways.