Biology · Coordination and Control
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Which of the following characters is not typical to class Mammalia?
- A
Alveolar lungs
- B
Seven cervical vertebrae
- C
Thecodont dentition
- D
Ten pairs of cranial nerves
The correct option is D. In higher vertebrates (reptiles, birds, mammals), there are 12 pairs of cranial nerves. Class mammals have an Alveolar lung, seven cervical vertebrae, Thecodont dentition, and 12 pairs of cranial nerves.
This option is incorrect because mammals have alveolar lungs, which are a distinctive feature of the class Mammalia.
This option is incorrect because most mammals have seven cervical vertebrae, making it a typical mammalian characteristic.
This option is incorrect because mammals possess thecodont dentition, where teeth are set in sockets, which is typical for the class.
This option is correct because mammals have 12 pairs of cranial nerves, not ten. Having ten pairs is not a characteristic of the class Mammalia.
Tagged under Biology · Coordination and Control · 2021