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Question 17N.3.SL.TZ0.11

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Date November 2017 Marks available [Maximum mark: 4] Reference code 17N.3.SL.TZ0.11
Level SL Paper 3 Time zone TZ0
Command term Explain Question number 11 Adapted from N/A
11.
[Maximum mark: 4]
17N.3.SL.TZ0.11

The picture shows workers cleaning up a polluted stretch of coastline in Alaska after oil was leaked from a tanker.

[Source: https://commons.wikimedia.org/wiki/File:OilCleanupAfterValdezSpill.jpg]

 

Explain how oil pollution can be treated by bioremediation.

[4]

Markscheme

a. bioremediation is the use of organisms to remove «or neutralize» pollutants

b. Pseudomonas species used in bioremediation of oil

c. oil biodegrades naturally at a very slow rate

d. bioremediation increases the rate that the oil breaks down

e. microorganisms feed/get energy from the oil

f. break the oil down into smaller nontoxic molecules

Accept other valid microorganism

[Max 4 Marks]

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