Question

Which of the following group of animals is correctly matched with its one characteristic feature without even a single exception?

• A. Reptilia possess three-chambered heart with one incompletely divided ventricle
• B. Chordata possess a mouth provided with an upper and a lower jaw
• C. Chondrichthyes possess cartilaginous endo-skeleton
• D. Mammalia give birth to young ones

Answer 1

The correct option is C Chondrichthyes possess cartilaginous endo-skeleton

Fish are essentially aquatic forms with paired fins for swimming and gills for respiration. Generally, all cartilaginous fish are included in Chondrichthyes and all bony fish in Osteichthyes. In cartilaginous fish (Chondrichthyes), the endoskeleton is entirely cartilaginous and the body remains covered by minute placoid scales. For example dogfish, sharks, rays, skates, etc.

Thus option C is the correct answer.