Question

Which one of the following groups of animals is correctly matched with its characteristic feature without any exception?

• A. Reptilia : possess 3-chambered heart with an incompletely divided ventricle
• B. Chordata : possess a mouth provided with an upper and a lower jaw
• C. Chondrichthyes: possess cartilaginous endoskeleton
• D. Mammalia: give birth to young ones

Answer 1

Answer: (C)

Chondrichthyes: possess cartilaginous endoskeleton

Answer 2

Reptiles usually possess 3-chambered heart but crocodiles are an exception with 4-chambered heart. Not all chordates have a mouth with upper and lower jaw. Egg laying mammals include duck-billed platypus. Chondrichthyes (cartilaginous fishes) are the fishes that have cartilaginous endoskeleton. There is no exception to this.