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Question 17N.3.SL.TZ0.10c

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.3.SL.TZ0.10c
Level SL Paper 3 Time zone TZ0
Command term Identify Question number c Adapted from N/A
c.
[Maximum mark: 1]
17N.3.SL.TZ0.10c

Researchers in Korea set up an experiment to measure how accumulation of biofilm changes in water pipes under different conditions.

The graph shows the accumulation of biofilm in steel pipes when the water was untreated, treated with chlorine and filtered through a membrane.

[Source: adapted from Yoonjin Lee, (2013), Journal of Environmental Research Public Health 2013, 10 (9), pages 4143 – 4160]

(c)

Identify which two pipes would be required to study the effect of heat on biofilm accumulation.

[1]

Markscheme

A and B

Both required

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