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Solution


Q.

Which of the following characteristic features always holds true for the corresponding group of animals            [2016]
1 Possess a mouth with an upper and a lower jaw - Chordata  
2 3-chambered heart with one incompletely divided ventricle - Reptilia  
3 Cartilaginous endoskeleton - Chondrichthyes  
4 Viviparous - Mammalia  

Ans.

(3)

Phylum Chordata includes both jawless vertebrates (Agnatha) and jawed vertebrates (Gnathostomata). Crocodile of Class Reptilia has four-chambered heart with two auricles and two ventricles. Duck-billed platypus and spiny anteater are oviparous mammals.