While comparing invertebrate groups, a mollusc removes metabolic wastes through paired kidney-like excretory organs. The feature being tested is:

Correct Answer: A

nephridia

Molluscs commonly possess nephridia or metanephridia for excretion. These organs help remove nitrogenous wastes and regulate internal fluids. This MCQ belongs to the Mollusca topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.