Teeth

Q.

Question 29
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.

Fig 2.3 of NCERT - Arrangement of teeth and different type of teeth.

Record your observations in the table below:

(a) Did you observe any difference in the number of teeth? If yes, could you identify which type of teeth showed the difference?

(b) 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.

Q.

Which is the hardest substance in our body?

Q.

How many molars are present in an adult human?

1. 12

2. 20

3. 8

4. 15

Q.

Which type of teeth are used when a person is taking a bite of an apple?

1. Canines

2. Premolars

3. Molars

4. Incisors

Q.

_______ helps to grind and crush food.

1. Pre molars

2. Canines

3. Molars

4. Incisors

Q.

Match the following.

Type of Tooth	No. of Teeth / Function
1) Incisors	A) 4 / Tearing
2) Canines	B) 8 / Grinding
3) Pre-Molars	C) 12 / Crushing
4) Molars	D) 8 / Cutting

1. 1 - C, 2 - A, 3 - B, 4 - D

2. 1 - D, 2 - A, 3 - B, 4 - C

3. 1 - B, 2 - A, 3 - D, 4 - C

4. 1 - D, 2 - C, 3 - B, 4 - A

Q.

A smooth silk thread used to clean teeth is known as __________ .

1. Tongue cleaner

2. Dental floss

3. Toothbrush

4. Mouthwash

Q. Question 29
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

Fig 2.3 of NCERT - Arrangement of teeth and different type of teeth.


observations in the table below:

(a) Did you observe any difference in the number of teeth? If yes, could you identify which type of teeth showed the difference?

(b) 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.

Q.

Among the following, which is used for biting and cutting the food?

1. Molars

2. Incisors

3. Premolars

4. Canines

Q.

The major component of enamel is

1. Sulphur

2. Carbon

3. Calcium

4. Magnesium

Q.

The correct dental formula for human beings is:

1. 2.1.2.3

2. 1.2.3.1

3. 1.2.3.4

4. 2.2.1.3

Q.

Write a note on arrangement of teeth. [5 MARKS]

Q.

Tongue is attached at the _____________ to the floor of the mouth cavity and is free at the _____________.

Q.

The following picture shows the different types of teeth present in your mouth. From the given options, select the one which matches with its name and function.

1. A -Incisor-Cutting and biting, B-Canines-Piercing and tearing, C-Premolars-Chewing and grinding, D-Molars-Chewing and grinding

2. A -Incisor- Chewing and grinding, B-Canines- Chewing and grinding, C-Premolars- Piercing and tearing, D-Molars- Cutting and biting

3. A -Incisor-Cutting and biting, B-Canines- Chewing and grinding, C-Premolars-Chewing and grinding, D-Molars- Piercing and tearing

4. A -Incisor- Chewing and grinding, B-Canines-Piercing and tearing, C-Premolars- Cutting and biting, D-Molars-Chewing and grinding

Q.

Which of the following is the primary function of canines?

1. Crushing

2. Tearing

3. Cutting

4. Grinding

Q.

In order to make tooth enamel stronger by converting $[3{\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2.\mathrm{Ca}{\left(\mathrm{OH}\right)}_2]$ to, the suggested fluoride ion concentration in drinking water is up to , $1\mathrm{ppm}$.

1. $[3\mathrm{Ca}{\left(\mathrm{F}\right)}_2.\mathrm{Ca}{\left(\mathrm{OH}\right)}_2]$

2. $[3{\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2.{\mathrm{CaF}}_2]$

3. $[3\mathrm{Ca}{\left(\mathrm{OH}\right)}_2.\mathrm{Ca}{\left(\mathrm{F}\right)}_2]$

4. $\left[{\mathrm{CaF}}_2\right]$

Q.

The first set of teeth that appear in babies are called _____ .

1. Premolars

2. Permanent teeth

3. Milk teeth

4. Molars

Q. Which tissue is present in the inner lining of the oesophagus?

Q. Match the types of teeth with their respective function.

1. Crushing
2. Cutting
3. Grinding
4. Tearing

Q. On an average how many teeth are present in an adult human being?

Q.

Write short notes on
Oral hygiene

Q. Fats are important for absorption of vitamins A, D, E and K.

1. True
2. False

Q. For how much time will the cattle chew their cud?

Q. Match the types of teeth with their respective function.

1. Crushing
2. Cutting
3. Grinding
4. Tearing

Q.

Renu went to a dentist in his area and discovered that our teeth are made of a hard structure called as enamel. Her dentist also mentioned that the enamel is made up of ____________ salts. What could be the possible explanation given by the dentist?

1. Calcium salts
2. Selenium salts
3. None of the above
4. Magnesium salts

Q.

The type of teeth which are used for biting and cutting are____________.

1. Canines

2. Premolars

3. Molars

4. Incisor

Q. Identify the epithelial tissue from the given statement.
Statement 1: Forms lining of kidney.
Statement 2: Forms lining of salivary glands

1. Cuboidal
2. Squamous
3. Columnar
4. Ciliated

Q.

Which food item from the given choices should be included in our diet to protect us from bleeding gums?

1. Amla
2. Cheese
3. Wheat
4. Yeast

Q.

As human teeth are different in shape and size, humans are called ___ .

Q. Human dentition is described as

1. Heterodont, monophyodont and thecodont
2. Heterodont, diphyodont, thecodont and bundodont
3. Heterodont, diphyodont and thecodont
4. Heterodont, polyphyodont and pleurodont