A student is revising Animal Diversity-I: a free-living freshwater flatworm with eyespots and strong regeneration is used in the lab. What should the student write in the answer sheet?

Planaria is a common free-living turbellarian flatworm. It is famous for regeneration and is often used to study basic flatworm structure and acoelomate organization. This MCQ belongs to the Turbellaria topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.