Question

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

• A. A - Incisor, B- Canine, C - Premolar , D- Molar
• B. A - Molar , B - Premolar, C -Canine , D-Incisor
• C. A - Incisors, B-Premolar, C-Canine , D- Molar
• D. A - Molar, B- Premolar, C-Incisor, D- Canine

Answer 1

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'.