NEET 2011 Biology question

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

(1)Reptilia : possess 3-chambered heart with one incompletely divided ventricle
(2)Chordata : possess a mouth provided with an upper and lower jaw
(3)Chondrichthyes : possess cartilaginous endoskeletonCorrect
(4)Mammalia : give birth to young one.

Answer: (3)

Solution

All members of Chondrichthyes (sharks, rays) have a cartilaginous endoskeleton without exception. In Reptilia, crocodiles have a four-chambered heart, so (1) has an exception. In Chordata, the jawless

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Question ID VK-090858