Question

Which of the following is not the feature of a cartilaginous fish?

• A. Bilaterally flattened body
• B. Absence of operculum
• C. Copulatory organ present
• D. Viviparity

Answer 1

Answer: (A)

Features related to Class Chondrichthyes (Cartilaginous fishes) are:
1. Endoskeleton is cartilaginous.
2. Mostly marine.
3. Usually dorsoventrally flattened.
4. The mouth is ventral.
5. Usually 5 - 7 pairs of gills without operculum (gill cover).
6. Placoid scales found.
7. Ureotelic.
8. Claspers present on pelvic fins.
9. Internal fertilization.
10. Mostly viviparous.