Question

Gills act as the respiratory organ in

• A. Aquatic animals like fish, prawns and mussels.
• B. Aquatic annelids, cnidarines and echinoderms.
• C. Aquatic crustaceans, molluscs and spongs.
• D. Amphibians, aquatic fishes, prwans and mussels.

Answer 1

The correct option is A Aquatic animals like fish, prawns and mussels.

A gill is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water and excretes carbon dioxide. The gills are present in fishes cartilaginous fishes as well as bony fishes, in aquatic organisms such as prawns and mussels.
Therefore, the correct answer is option A.