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Question

The given schematic diagram depicts heterodont teeth and its thecodont arrangement . Find the correct labelling for A - D fom the options given below.

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A
A - Incisor, B- Canine, C - Premolar , D- Molar
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B
A - Molar , B - Premolar, C -Canine , D-Incisor
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C
A - Incisors, B-Premolar, C-Canine , D- Molar
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D
A - Molar, B- Premolar, C-Incisor, D- Canine
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Solution

The correct option is B A - Molar , B - Premolar, C -Canine , D-Incisor
  • Humans have heterodont teeth as we have four different types of teeth namely- incisors, canines, molars, and premolars.
  • The teeth in humans are embedded deep in the sockets of the jaw bone hence, called the thecodont.
1) Incisors-  we have 4 incisors each on the upper and lower.
  • Function- Its main function is to bite the food. 
2) Canines- we have two canines on the upper and lower jaw. 
  • These are the sharpest teeth.
  • Function-  It helps to tear the food.
3) Premolars- are also known as bicuspids.
  • We have two premolars each on the upper and the lower jaw.
  • Function- they help in chewing and grinding food. 
4) Molars-  we have 3 molars each on the upper and lower jaw.
  • Function-  they also help in chewing and grinding food.
  • The dentition in humans is 2123- incisors-2, canines-1, premolars- 2, molars- 3.
  • So, the correct answer is 'A - molar, B - premolar, C - canine, D-incisor'.

Biology

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