2. Complete Activity 2.2 (Page 13). Wash your hands. Look into the mirror and count your teeth. Use your index finger to feel the teeth. How many kinds of teeth could you find? Take a piece of an apple or bread and eat it. Which teeth do you use for biting and cutting, and which ones for piercing and tearing? Also find out the ones that are used for chewing and grinding? Record your observations in Table 2.2.
Table 2.2
| Type of Teeth | Number of teeth | Total | |
| Lower jaw | Upper jaw | ||
| Cutting and biting teeth (Incisors) | |||
| Piercing and tearing Teeth (Canines) | |||
| Chewing and grinding teeth (Premolars and molars) | |||
Answer: The above activity can be carried out in the following ways:
Aim: To feel your teeth and identify the different kinds of teeth you have and for what purposes they are used.
Materials Required: Mirror, apple, bread.
Procedure:
(i) Wash your hands, open your mouth in front of the mirror and count your teeth.
(ii) Use your index finger to feel the different kinds of teeth.
(iii) Now take the piece of apple or bread and eat it. Identify which teeth you use for biting and cutting, which ones for piercing and tearing and which ones that are used for chewing and grinding. Record your observations in Table 2.2.
Observations and Conclusions:
The different types of teeth in the jaw are shown below:
In each jaw there are 4 incisors, 2 canines and 10 premolars and molars. Incisors are used for cutting and biting, canines are used for piercing and tearing and premolars and molars are the chewing and grinding teeth. The complete Table 2.2 is shown below:
Table 2.2
| Type of Teeth | Number of teeth | Total | |
| Lower jaw | Upper jaw | ||
| Cutting and biting teeth (Incisors) | 4 | 4 | 8 |
| Piercing and tearing Teeth (Canines) | 2 | 2 | 4 |
| Chewing and grinding teeth (Premolars and molars) | 10 | 10 | 20 |
“Wash your hands. Look into the mirror and count your teeth. Use your index finger to feel the teeth. How many kinds of teeth could you find? Take a piece of an apple or bread and eat it. Which teeth do you use for biting and cutting, and which ones for piercing and tearing? Also find out the ones that are used for chewing and grinding? Record your observations in Table 2.2.” – Solved.
Solution to Extended Learning Problem 1
Solution to Extended Learning Problem 2
Solution to Extended Learning Problem 3
Solution to Activity 2.1
Solution to Activity 2.3
Solution to Activity 2.4
Solutions to Chapter 2 Nutrition in Animals
