Concept:Paramecium has a specialised feeding apparatus made up of the oral groove and the gullet.
Explanation:The body of Paramecium has a depressed side known as the oral groove.
This groove is lined with cilia that beat to sweep food particles into the cell.
The oral groove narrows into a tube-like channel called the gullet, also known as the buccal cavity.
Food particles move through the gullet and collect at its inner end to form food vacuoles.
The anal pore is used for expelling undigested waste, not for food intake.
Therefore, the tube-like structure that the ciliated depressed side leads to is the gullet.
Answer:C. gullet
