NEET 2016 Phase 1 · BiologyVertebrate gridPrevious Year Question
Which of the following characteristic features always holds true for the corresponding group of animals? Each option pairs a characteristic feature with an animal group. (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 Choose the pairing that is always correct.
Answer: (A) Cartilaginous endoskeleton - Chondrichthyes. Answer: Cartilaginous endoskeleton always holds true for Chondrichthyes.
- 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
Correct Answer
(A) Cartilaginous endoskeleton - Chondrichthyes
Solution & Explanation
Answer: Cartilaginous endoskeleton always holds true for Chondrichthyes. Solution: All Chondrichthyes have a cartilaginous endoskeleton. The others fail: egg-laying mammals (Ornithorhynchus) are not viviparous; jawless cyclostome chordates lack jaws; and crocodilian reptiles have a four-chambered heart. NCERT Reference: Page 47, lines 38-39 (Chondrichthyes cartilaginous endoskeleton)
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