Which of the following represents the correct combination of a taxonomic group with its characteristics, without any exception?

Easy

A

Group - Reptilia ; Characteristics - Crawling mode of locomotion, all are terrestrial
B

Group - Chondrichthyes ; Characteristics - Placoid scales, electric organs, claspers
C

Group - Amphibia ; Characteristics - Tympanum, two pairs of limbs
D

Group - Mammalia ; Characteristics - Mammary glands, lungs, direct development

Solution

All mammals possess mammary glands, lungs and undergo direct development. Some reptiles are aquatic (e.g., sea snakes, turtles). Electric organs are present only in some cartilaginous fishes (e.g., Torpedo); not all. Some amphibians are limbless (e.g., Ichthyophis).

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