Question

As compared to cartilaginous fishes, bony fishes have ........... dorsal fin.

• A. Single instead of two
• B. Two instead of one
• C. Single in both
• D. Two in both

Answer 1

The correct option is A Single instead of two

Dorsal fins are located at the back of the body of the fish. These fins help the fish in turning and stopping. Cartilaginous fishes belong to class Chondrichthyes and have paired fins. Hence, they have two dorsal fins. On the other hand, bony fishes belong to class Osteichthyes and have a single dorsal fin.

So, the correct answer is 'Single instead of two'.