Features of Fish: Bony Fishes

The video discusses bony fish, or Osteichythes, the largest class of vertebrates. It covers their diversity, habitats, and key characteristics. The major groups include lobe-finned, lung, and ray-finned fishes. Lobe-finned fishes, once thought extinct, include the coelacanth. Lung fishes can breathe outside water. Ray-finned fishes, the largest group, have fan-like fins and are widely distributed. Their evolution is well-documented in the fossil record.

Which of the following is a characteristic feature of Osteichythes?

• Bony skeletons

• Lack of swim bladders

• Cartilaginous skeletons

• No fins

What significant discovery was made in 1938 regarding lobe-finned fishes?

• Ray-finned fishes were classified

• A coelacanth was caught

• Lung fishes were declared extinct

• The first lung fish was found

How do lung fishes survive during droughts?

• By using their lung-like structures

• By hibernating

• By storing water in their bodies

• By migrating to other water bodies

Which group of bony fishes is the largest in terms of species diversity?

• Ray-finned fishes

• Lobe-finned fishes

• Lung fishes

• Cartilaginous fishes

What is a common characteristic of ray-finned fishes?

• Fan-like fins supported by thin bones

• Lack of fins

• Cartilaginous skeletons

• Presence of gills only