Question

Which of the following statements is stated incorrect regarding cartilaginous fishes?

• A. Cartilaginous fishes have sense organs.
• B. Most cartilaginous fishes have colour vision.
• C. Teeth-like placoid scales are found on the skin of cartilaginous fishes.
• D. In cartilaginous fishes, exchange of gas takes place through gills.

Answer 1

The correct option is B Most cartilaginous fishes have colour vision.

Most of the cartilaginous fishes have sense organs mediating vision, olfaction, gustation, lateral line, electroreception, and audition. Their bodies are covered with an exoskeleton of placoid scales and they have gills that help in respiration. However, cartilaginous fishes do not have a color vision.

So, the correct answer is 'Most cartilaginous fishes have color vision.'.