A student is revising Animal Diversity-I: a small meiofaunal animal glides across sediment using cilia on its lower surface. What should the student write in the answer sheet?

Correct Answer: B

ciliated ventral surface

Gastrotrichs commonly move by cilia located on the ventral surface. Their small size and ciliated locomotion suit life among particles in freshwater or marine sediments. This MCQ belongs to the Gastrotricha topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.