NEET | 2016Animal KingdomHard

Question

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

Options

A.

Cartilaginous endoskeleton - Chondrichthyes

B.

Viviparous - Mammalia

C.

Possess a mouth with an upper and a lower jaw - Chordata

D.

3 - chambered heart with one incompletely divided ventricle - Reptilia

Solution

Reptillia has an order crocodilian which shows 4 chambered heart. In mammals, prototheria group shows oviparity while metatheria and eutherian show viviparity. Chordates can be gnathostomata and agnatha (without jaws). Only cartilaginous fishes (chondrichthyes) show cartilaginous endoskeleton without exception.

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