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Which one of the following groups of animals is correctly matched with its one characteristic feature without even a single exception?

  1. A
    Mammalia : give birth to young ones
  2. B
    Reptilia : possess 3-chambered heart with one incompletely divided ventricle
  3. C
    Chordata : possess a mouth provided with an upper and a lower jaw
  4. D
    Chondrichthyes : possess cartilaginous endoskeleton

Solution & Step-by-step Explanation

All members of the class Chondrichthyes (cartilaginous fishes like sharks and rays) possess a cartilaginous endoskeleton without exception.Mammalia: Platypus is oviparous (lays eggs).Reptilia: Crocodiles have a 4-chambered heart.Chordata: Agnatha (jawless fish) do not have jaws.

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Which one of the following groups of animals is correctly matched with its one characteristic feature without even a single exception?
A
Mammalia : give birth to young ones
B
Reptilia : possess 3-chambered heart with one incompletely divided ventricle
C
Chordata : possess a mouth provided with an upper and a lower jaw
D
Chondrichthyes : possess cartilaginous endoskeleton

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Animal KingdomChordata

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