Number of teeth which are monophyodont in man is -

Options

A. 4
B. 22
C. 32
D. 12

Answer

To determine the number of monophyodont teeth in humans, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Term "Monophyodont":**
- Monophyodont teeth are those that grow only once in a person's lifetime. This means they do not fall out and are not replaced.

2. **Identify Types of Teeth in Humans:**
- Humans have two sets of teeth during their lifetime: primary (milk) teeth and permanent teeth.
- Primary teeth are eventually replaced by permanent teeth, while monophyodont teeth do not have a replacement.

3. **Human Dental Formula:**
- The dental formula for adults is typically represented as:
- 2-1-2-3 (for half of the jaw)
- This means: 2 incisors, 1 canine, 2 premolars, and 3 molars.
- Therefore, for a full set of teeth (both upper and lower jaws), the total number of teeth is 32.

4. **Identify Monophyodont Teeth:**
- In humans, the only teeth that are considered monophyodont are the third molars (wisdom teeth) and the second molars, which typically do not have replacements.
- However, it is important to note that the primary teeth (milk teeth) are not monophyodont as they are replaced by permanent teeth.

5. **Count the Monophyodont Teeth:**
- The teeth that grow only once in a lifetime are the second molars and the third molars (wisdom teeth).
- In total, there are 12 teeth that are classified as monophyodont in humans: 2 premolars and 1 molar from each quadrant (4 quadrants) of the mouth.

6. **Conclusion:**
- Therefore, the total number of monophyodont teeth in humans is 12.

### Final Answer:
The number of teeth which are monophyodont in man is **12**.

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