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Date	May 2019	Marks available	4	Reference code	19M.3.SL.TZ2.11
Level	Standard level	Paper	Paper 3	Time zone	Time zone 2
Command term	Explain	Question number	11	Adapted from	N/A

Question

Explain the use of two named bacteria in response to pollution incidents.

Markscheme

a. bacteria metabolize pollutants
OR
bacteria used in bioremediation
OR
microorganisms use pollutant as an energy source/carbon source ✔

first named bacteria:
b. name of bacterium used in bioremediation «eg: Pseudomonas» ✔ Allow any other verified example.

c. name of pollutant/substrate «eg: oil/methyl mercury» ✔

d. product of degradation «eg: CO₂ and H₂O/elemental mercury» ✔

second named bacteria:
e. name of bacterium used in bioremediation «eg: Marinobacter» ✔ Allow any other verified example.

f. name of pollutant/substrate «eg: benzene» ✔

g. product of degradation «eg: CO₂» ✔

Award [3 max] if two bacteria are not named

Examiners report

Good explanations were given of the use of bacteria in response to pollution incidents. This was the best answered question in this option.

Syllabus sections

Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics) » B.3 Environmental protection

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19M.3.HL.TZ1.11a:
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………………......… mol m^–3
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[Source: https://commons.wikimedia.org/wiki/File:OilCleanupAfterValdezSpill.jpg]

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[Source: © International Baccalaureate Organization 2020.]

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Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics)

Option B: Biotechnology and bioinformatics

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Markscheme

Examiners report

Syllabus sections

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