Question

Write down four characters of Chondrichthyes. Give two examples.

Answer 1

(i) Marine fishes with completely cartilaginous endoskeleton are called chondrichthyes. They are gaenerally large in size.
(ii) Streamlined body is either laterally compressed or spindle-shaped or dorsoventrally flattened and disc shaped.
(iii) Mouth is ventral in position.
(iv) Skin is tough and covered with minute placoid scales.
Example: Scoliodon (dog fish) and Torpedo (electric ray)