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 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

Reptilia possess 3-chambered heart with an incompletely divided ventricle and two atria. However, the crocodile is an exception as it has the 4-chambered heart. Chordata possesses a mouth provided with an upper and a lower jaw except for jawless fishes. All Chondrichthyes possess cartilaginous endoskeleton without exception. Mammalia gives birth to young ones. However, Monotremes are mammals that lay eggs instead of giving birth to live young.

Thus, the correct answer is option C.