Q. Which one of the following characters is not typical of the class-mammalia ?
A) Seven cervical vertebrae
B) Thecodont dentition
C) Ten pairs of cranial nerves
D) Alveolar lungs
Explanation
[Solution from source] Mammals have twelve pairs of cranial nerves; ten pairs is the condition in fishes and amphibians. Seven neck vertebrae, teeth set in sockets (thecodont) and alveolar lungs are all typical mammalian traits. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.