DP Biology (last assessment 2024)

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Question 20N.3.SL.TZ0.17a

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.3.SL.TZ0.17a
Level SL Paper 3 Time zone TZ0
Command term Identify Question number a Adapted from N/A
a.
[Maximum mark: 3]
20N.3.SL.TZ0.17a
(a)

The table shows the origin and function of gastric secretions in the digestive system.

Identify the missing items by completing the table.

[3]

Markscheme

Secretion: gastrin;
Function: digest proteins;
Secreting cells: parietal;

If more than one answer do not give the mark unless all are correct.

Examiners report

Both parts (a) and (b) were good discriminating questions. Weaker candidates could possibly score one mark from three for completion of the table and explaining that acid damages the stomach walls. Weaker candidates said that Helicobacter pylori increased HCl production or attacked the stomach wall.

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