Fig. 1 shows a section through one of a student's molar teeth. The student is comparing foods that need different amounts of chewing before swallowing. Tabl...
Question 1 Report
Fig. 1 shows a section through one of a student's molar teeth. The student is comparing foods that need different amounts of chewing before swallowing. Table 1 shows the mean number of chews recorded for 20 g portions of two foods.
Table 1
| food | mean number of chews |
|---|---|
| raw carrot | 34 |
| soft bread | 12 |
(a) Name the structures labelled X and Y in Fig. 1. [2]
(b) Describe the difference shown in Table 1. [1]
(c) Explain why chewing is an important stage of digestion before food reaches the stomach. [1]
Answer Details
(a) X is enamel and Y is dentine. Enamel is the hard outer layer; dentine lies beneath it. [2]
(b) Raw carrot needed more chews than soft bread, \(34\) compared with \(12\). [1]
(c) Chewing breaks food into smaller pieces, increasing surface area for enzyme action. It also makes swallowing easier. [1]
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