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NEET2016BotanyAnimal KingdomActual

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

Options

  1. ACartilaginous endoskeleton - Chondrichthyes
  2. BViviparous - All mammals
  3. CPossess a mouth with an upper and a lower jaw - Chordata
  4. D3 – chambered heart with one incompletely divided ventricle - Reptilia

Correct answer

A. Cartilaginous endoskeleton - Chondrichthyes

Step-by-step 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 (jawed organism) and agnatha (without jaws). Only cartilaginous fishes (chondrichthyes) show cartilaginous endoskeleton without any exception.

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