Which of the following characteristic features always holds true for the corresponding group of animals ?(1) Cartilaginous endoskeleton | Chondrichthyes(2) Viviparous | Mammalia(3) Possess a mouth with an upper and a lower jaw | Chordata(4) 3 - chamb…

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

(1) Cartilaginous endoskeleton | Chondrichthyes

(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

1. Cartilaginous endoskeleton - Chondrichthyes

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

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 Practice test neet Save WhatsApp Report

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Answer: 1. Cartilaginous endoskeleton - Chondrichthyes

Class Chondrichthyes (sharks, rays) always has a cartilaginous endoskeleton.

2: Not all mammals are viviparous; the platypus and echidna lay eggs.
3: Jaws are not found in all chordates; Agnatha (jawless fishes) lack them.
4: Most reptiles have a 3-chambered heart, but crocodiles have a 4-chambered heart, so it is not always true.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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