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Question
Differentiate the following.
Diphyodont and Heterodont
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Solution
| Diphyodont | Heterodont |
| In human beings two sets of teeth (Diphyodont) are developed in their life time. | Permanent teeth are of four types (Heterodont). |
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RELATED QUESTIONS
Every day we should brush our teeth _______ times.
List out the food items for healthy mouth and teeth.
Name the types of teeth present in an adult human being. Mention the functions of each.
The crown of the tooth is covered by the hardest substance of the body called the ____________.
Match the Column I with Column II and select the correct option.
| Column I | Column II |
| i. Heterodont | a. Teeth embedded in separate sockets in jaw bone |
| ii. Diphyodont | b. Four sets of teeth |
| iii. Thecodont | c. Two sets of teeth in lifetime |
What is milk teeth?
Teeth are rooted in separate ______ in between the ______.
Open your mouth, look into a mirror and try to count the different types of teeth in your mouth. Compare them with Figure on page 13 of your NCERT textbook.
Record your observations in the table below:
| Type of teeth | Number of teeth | |
| In my mouth | In the figure | |
| Incisors | ||
| Canines | ||
| Premolars | ||
| Molars | ||
- Did you observe any difference in the number of teeth? If yes, could you identify which type of teeth showed the difference?
- Compare the number and type of teeth in an adult (say your parents or cousins who have reached the age of 25-30 or more). Note your observation.
Write a note on the teeth of humans.
Collect data from your friends, neighbours and classmates to know more about “milk teeth".
Tabulate your data. One way of doing it is given below:
| S.No. | Age at which first tooth fell | Age at which last tooth fel | No. of teeth lost | No. of teeth replaced |
| 1. | ||||
| 2. | ||||
| 3. | ||||
| 4. | ||||
| 5. |
Find out from at least twenty children and find the average age at which children lose the milk teeth. You may take help of your friends.
