O-LevelBiologyHuman Nutrition5090/21 · Oct/Nov 2018 · Q710 Marks
The diagram shows a region of the alimentary canal and the associated organs. [Figure 7.1]
- (a)(i)Identify part S.[1]
- (a)(ii)Name and describe the process which moves food through part S.[4]
- (b)(i)Draw a ring around the correct words to complete the sentence below. higher than the same as lower than The pH at location U is that at location T.[1]
- (b)(ii)Explain how the pH at location U results from secretions produced by organs shown in the diagram. Name these organs.[4]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.
- [1] oesophagus / gullet;
- [4] peristalsis; wave of/rhythmic + contraction; circular muscles ; behind / pushing (food) ;
- [1] higher than;
- [4] liver; bile; pancreas; pancreatic juice / secretions / hydrogencarbonate ; bile / pancreatic juice + alkaline / high pH ;
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