DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.a

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.2.SL.TZ0.a
Level SL Paper 2 Time zone TZ0
Command term Evaluate Question number a Adapted from N/A
a.
[Maximum mark: 2]
20N.2.SL.TZ0.a

Evaluate the effect of salt on blood pressure using the data in the graph.

[2]

Markscheme

a. systolic pressure increases with salt in diet during treatment;

b. diastolic pressure is slightly higher/no change with salt during treatment
OR
diastolic pressure only changes towards the end of the period;

c. (blood) pressure goes back to normal after treatment
OR
salt causes increased (blood) pressure;

d. standard deviation values overlap therefore not statistically significant;

Examiners report

The majority could evaluate that salt increased blood pressure, most comparing the effect on systolic and diastolic blood pressure.

Syllabus sections