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Question and Answer

Which one of the following groups of animals is correctly matched with its characteristic feature without any exception ?
(A) Reptilla : 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: C
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.
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