O-LevelBiologyHuman Nutrition5090/21 · Oct/Nov 2017 · Q110 Marks
Fig. 1.1 shows four types of human teeth A, B, C and D. [Figure 1.1] Fig. 1.2 below shows the arrangement of teeth in the lower jaw of a human.
- (a)Complete Fig. 1.2 to show the following for each of the two types of teeth indicated: • the identity of each type of tooth by writing the correct letter A, B, C or D from Fig. 1.1 • the name of each type of tooth • one function of each type of tooth.[6]
- (b)(i)State the causes of dental decay.[2]
- (b)(ii)Describe the proper care of teeth.[2]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [6] (a) B; incisor; biting / cutting / tearing / gripping; C; molar; chewing / crushing / grinding ;
- [2] (b)(i) sugar; bacteria; respiration; acid; plaque;
- [2] (b)(ii) reference to brushing; flossing; fluoride; reference to dental check-ups ;
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