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Standard X
Biology
Class Mammalia
Question

Which one of the following is not a feature of mammals?
  1. Four chambered heart
  2. Seven cervical vertebrae
  3. Diaphragm
  4. Homodont dentition

A
Seven cervical vertebrae
B
Four chambered heart
C
Homodont dentition
D
Diaphragm
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Solution
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Mammals have some key characteristic features such as four-chambered hearts, seven cervical vertebrae, muscular diaphragm, mammary gland and the presence of placenta. Mammals have thecodont teeth which mean that the teeth fit in a socket of the jawbone. The teeth are heterodont which means that there are different types of teeth. Mammals possess heterodont and not homodont.
Thus, the correct answer is option C.

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