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IGCSE Biology Extended7.3.5—Functions of the types of human teethTopic Practice

7.3.5—Functions of the types of human teeth

• Describe the functions of the types of human teeth in physical digestion of food

Question 1(a)(i)

[Maximum number: 1]

Fig. 1.1 is a side view of a human skull indicating the four types of teeth and the jaws.

Fig. 1.1

Fig. 1.1

State the function of human teeth.

Question 9

[Maximum number: 1]

The diagram shows the four types of human tooth.

incisor

incisor

2

2

3

3

molar

molar

Which teeth are used for grinding food?

A

1 and 2

B

2 and 3

C

3 and 4

D

4 and 1

Question 2

Question 2(b)

(a)

Describe and explain the function of molar teeth.

[ 3 ]

Question 2(c)

(b)

Fig. 2.2 is an X-ray of decay in a molar tooth.

Fig. 2.2

Fig. 2.2

Explain how tooth decay occurs.

[ 4 ]

Question 13

[Maximum number: 1]

The diagram shows a human tooth.

Question image

Which statement best describes the function of this tooth?

A

It bites into food.

B

It cuts food.

C

It grinds food.

D

It tears food.

Question 13

[Maximum number: 1]

The diagram shows a person's teeth. Some of their teeth are missing.

Question image

What would the person find difficult?

A

biting apples

B

drinking water

C

grinding meat

D

tearing dry bread

Question 13

[Maximum number: 1]

Which human teeth are used for biting and cutting food?

A

canines and molars

B

incisors and canines

C

molars and premolars

D

premolars and incisors

Question 3(a)(ii)

[Maximum number: 1]

Very small pieces of plastic, called microplastics, are found in many products such as soaps and toothpaste.

Fig. 3.1 shows toothpaste that contains microplastics.

Fig. 3.1

Fig. 3.1

State one recommendation, other than regular brushing, for the proper care of teeth.

Question 15

[Maximum number: 1]

The graph shows pH changes in the mouth after eating.

Question image

Why is it a good idea to brush teeth after eating?

A

Acidic conditions help bacteria to grow.

B

Acids dissolve tooth enamel.

C

Alkaline conditions help bacteria to grow.

D

Alkalis dissolve tooth enamel.

Question 16

[Maximum number: 1]

What is the cause of the start of dental decay?

A

Acid dissolves dentine.

B

Acid dissolves enamel.

C

Sugars dissolve dentine.

D

Sugars dissolve enamel.

Question 5(a)

[Maximum number: 2]

Fig. 5.1 shows the different types of human teeth.

Fig. 5.1

Fig. 5.1

Describe the functions of the canine and molar teeth.

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