DP Biology (first assessment 2025)

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Question 19N.1B.SL.TZ0.1c

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.1B.SL.TZ0.1c
Level SL Paper 1B Time zone TZ0
Command term State Question number c Adapted from N/A
c.
[Maximum mark: 2]
19N.1B.SL.TZ0.1c
(c)

State two variables other than temperature and light that should be controlled in this experiment, in order to discover which system is more effective at removing nutrients from water.

[2]

Markscheme

a. type/number of plants ✔

b. type of soil/substrate ✔

c. pH level ✔

d. initial concentration of nutrients ✔

e. timespan of experiment ✔

f. volume of water/influent
OR
flow rate ✔ Do not accept amount instead of volume.

If more than two variables written, mark only the first two.

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