Advertisements
Advertisements
Question
Differentiate the following.
Diphyodont and Heterodont
Solution
| Diphyodont | Heterodont |
| In human beings two sets of teeth (Diphyodont) are developed in their life time. | Permanent teeth are of four types (Heterodont). |
APPEARS IN
RELATED QUESTIONS
Every day we should brush our teeth _______ times.
Differentiate the following.
Incisors and Canines
Number of teeth present in each jaw is ______.
What is milk teeth?
Name the four types of the permanent teeth.
How do you take care of your mouth and teeth?
Label the below given Figure 2.1 as directed below in (i) to (iv) and give the name of each type of tooth.
- The cutting and biting teeth as ‘A’
- The piercing and tearing teeth as ‘B’
- The grinding and chewing teeth as ‘C’
- The grinding teeth are present only in adults as ‘D’
Open your mouth, look into a mirror and try to count the different types of teeth in your mouth. Compare them with Figure 2.3 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.
