Question

Choose the correct statement.

• A. All Pisces have gills covered by an operculum
• B. All mammals are viviparous
• C. All cyclostomes do not possess jaws and paired fins
• D. All reptiles have a three-chambered heart

Answer 1

The correct option is C All cyclostomes do not possess jaws and paired fins

Cyclostomata is a class belonging to division Agnatha of subphylum- Vertebrata. It is a superclass of jawless fishes. They lack paired fins too.

All pisceans do not have gills covered by an operculum. They are absent in a few chondrichthyans.
All mammals except the platypus and the echidnas are viviparous.
Except for the species crocodilians, which have a four-chambered heart, all reptiles have a three-chambered heart consisting of two atria and one ventricle.