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IGCSE Biology Extended7.3.4—Structure of human teethTopic Practice

7.3.4—Structure of human teeth

• Describe the structure of human teeth, limited to: enamel, dentine, pulp, nerves, blood vessels and cement, and understand that teeth are embedded in bone and the gums

Question 1(b)(ii)

[Maximum number: 2]

Food that sticks to the teeth can be used by bacteria for anaerobic respiration.

This type of respiration releases a substance that can cause tooth decay.

State the names of the two parts of a tooth that are dissolved by the substance released by bacterial respiration.

1
2

Question 1

Question 1(a)

(a)

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

[ 4 ]

Question 1(a)(ii)

(i)

State the name of the visible outer layer of the teeth.

[ 1 ]

Question 1(a)(iii)

(ii)

Explain the process of tooth decay in humans.

[ 3 ]

Question 11

[Maximum number: 1]

The diagram shows a tooth.

Question image

What are the parts labelled 1,2 and 3 ?

1

2

3

dentine

enamel

pulp

enamel

dentine

pulp

enamel

pulp

dentine

pulp

dentine

enamel

Question 2(a)

[Maximum number: 4]

Fig. 2.1 is a vertical section of a human molar tooth and surrounding structures.

Fig. 2.1

Fig. 2.1

State the names of the parts labelled A to D on Fig. 2.1.

A

B
C

D

Question 13

[Maximum number: 1]

The diagram shows a tooth with signs of decay.

Question image

What has made the hole in the enamel of the tooth?

A

acid

B

saliva

C

sugar

D

toothpaste

Question 6(d)(ii)

[Maximum number: 2]

Fig. 6.1 is a flow diagram that shows what happens at the start of a bacterial infection.

Fig. 6.1

Fig. 6.1

Explain how bacteria dissolve enamel to cause tooth decay.

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