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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
Detailed Solution
All members of class Chondrichthyes (sharks, rays, skates) have a cartilaginous endoskeleton; there is no exception.
Mammalia: the egg-laying mammals (monotremes such as the platypus, $Ornithorhynchus$) do not give birth to young ones.
Reptilia: crocodiles have a four-chambered heart.
Chordata: cyclostomes (lampreys and hagfishes) are jawless (Agnatha), and protochordates also lack jaws.
Hence the group matched without exception is Chondrichthyes: possess cartilaginous endoskeleton.
Mammalia: the egg-laying mammals (monotremes such as the platypus, $Ornithorhynchus$) do not give birth to young ones.
Reptilia: crocodiles have a four-chambered heart.
Chordata: cyclostomes (lampreys and hagfishes) are jawless (Agnatha), and protochordates also lack jaws.
Hence the group matched without exception is Chondrichthyes: possess cartilaginous endoskeleton.