Operculum.

Operculum.

• A. Scales
• B. Operculum
• C. Fins
• D. Lateral line

Answer: (B)

The operculum is the protective bony flap that covers a fish’s gills and forms the gill chamber. It plays a key role in breathing by helping to move water over the gills, aiding gas exchange. While the scales protect the body, fins provide movement, and the lateral line detects water vibrations, the operculum specifically refers to that gill-covering structure.

The operculum is the protective bony flap that covers a fish’s gills and forms the gill chamber. It plays a key role in breathing by helping to move water over the gills, aiding gas exchange. While the scales protect the body, fins provide movement, and the lateral line detects water vibrations, the operculum specifically refers to that gill-covering structure.