O-LevelBiologyHuman Nutrition5090/22 · Oct/Nov 2014 · Q210 Marks
Fig. 2.1 shows parts of the alimentary canal that lie in the upper part of the human body. [Figure 2.1]
- (a)(i)Name the part labelled E.[1]
- (a)(ii)Name the process that carries food from F to G.[1]
- (b)Suggest why the walls of part H are normally coated with mucus.[5]
- (c)(i)Sometimes, particularly when a person is lying flat, partly digested food returns into structure E through the valve at G. This can cause discomfort known as heartburn. Suggest why heartburn is not a biologically accurate name for this condition.[1]
- (c)(ii)Suggest and explain why medications for this condition are often alkaline in nature.[2]
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 2014). The mark or mark type is shown in brackets.
- [1] oesophagus / gullet ;
- [1] peristalsis ;
- [max. 5] ref. protection / barrier / prevents damage / breakdown / digestion ;
- of walls;
- acid / HCl;
- ref. protease;
- walls are made of protein ;
- ref. lubrication ;
- [1] heart not involved / no connection between E and the heart / AW;
- [max. 2] less mucus in E ;
- acid (from stomach);
- (acid) damages the cells/walls ;
- (acid) neutralised (by the medication) ;
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →