| Date | May 2016 | Marks available | 2 | Reference code | 16M.3.SL.TZ0.18 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Outline | Question number | 18 | Adapted from | N/A |
Question
Outline the importance of acid conditions in the stomach.
[2]
a.
Suggest one reason for a correlation between a low-fibre diet and a higher incidence of gastrointestinal problems.
[1]
c.
Markscheme
Acidity activates digestive enzyme «pepsinogen»
Hydrolysis/breakdown of food
Acidity destroys unwanted bacteria/pathogens
Provides optimum pH for enzymes/pepsin to function
a.
Increased contact time between intestinal wall and food
Increase interaction with surface and undesirable food chemicals
The density/hardness of the stool can make it harder to egest causing damage to tissues
Increases digestive tract conditions/diseases/constipation
c.
Examiners report
Most candidates could outline the importance of acid conditions in the stomach.
a.
N/A
c.
