Question

Lung fishes have

• A. Uncovered well developed gills
• B. Covered well developed gills
• C. Reduced but covered gills
• D. Air bladder

Answer 1

The correct option is D Air bladder

In lung fishes, air bladder is modified for gaseous exchange. These fishes can respire through both gills and lungs. They are facultative air breathers as they normally breathe through gills but when the water is less, they respire through lungs.

So, the correct answer is 'Air bladder'.