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Question 18M.3.SL.TZ2.9b

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.SL.TZ2.9b
Level SL Paper 3 Time zone TZ2
Command term State Question number b Adapted from N/A
b.
[Maximum mark: 1]
18M.3.SL.TZ2.9b

A build-up of salt (NaCl) in soil is known as salinization. This can make the soil unsuitable for agriculture. One strategy that has been used to address this problem is to add compost mixed with salt-metabolizing bacteria to this soil. The bacteria loosen the association of the Na+ with the soil and allow it to be washed out by rain more effectively. The graph shows the effect of bacteria over time on the amount of salt in the soil.

(b)

State the name of the strategy that involves the use of organisms to remove toxic substances from a contaminated site.

[1]

Markscheme

bioremediation

Examiners report

 

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