Question

Which one of the following groups of animals are correctly matched with their one characteristic feature without any exceptions?

• 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

Answer 1

The correct option is D Chondrichthyes - possess cartilaginous endoskeleton

Marsupials and monotremes are exceptions in mammals which are oviparous instead of viviparous.
Crocodile is an exception in reptiles who does not possess a 3-chambered heart but possess a 4-chambered heart.
Agnatha is a superclass in the phylum Chordata which consists of jawless fishes.
Chondrichthyes are jawed fishes with paired fins. They have paired nares, scales, a heart with its chambers in series and skeletons made of cartilage (rather than bone). There are no exceptions.

Thus, the correct answer is option D.