While comparing invertebrate groups, a slipper-shaped protozoan swims rapidly because its body is covered with short hair-like structures. The feature being tested is:

Correct Answer: B

cilia

Paramecium uses cilia for locomotion and feeding currents. Cilia beat in coordinated waves and are shorter and more numerous than flagella. This MCQ belongs to the Paramecium topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.