NEET 2016 Biology question

Which of the following characteristic features always holds true for the corresponding group of animals?

(1)Cartilaginous endoskeleton - ChondrichthyesCorrect
(2)Viviparous - Mammalia
(3)Possess a mouth with an upper and a lower jaw - Chordata
(4)3 - chambered heart with one incompletely divided ventricle - Reptilia

Answer: (1)

Solution

All Chondrichthyes (sharks, rays) have a cartilaginous endoskeleton without exception, so (1) always holds true. Not all mammals are viviparous - the monotremes (e.g. Platypus, Echidna) lay eggs, so (2) is wrong. Not all

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Question ID VK-091979