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Date	May 2019	Marks available	1	Reference code	19M.1.HL.TZ2.23
Level	Higher level	Paper	Paper 1	Time zone	Time zone 2
Command term	Identify	Question number	23	Adapted from	N/A

Question

The global carbon cycle involves sinks where carbon is stored, and fluxes where carbon is transferred. What are the largest sink and flux?

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In Topic 4.3 candidates had to estimate carbon fluxes due to processes in the carbon cycle. Candidates should have known that respiration and combustion return carbon dioxide to the atmosphere while photosynthesis uses this carbon dioxide. The total amount for the carbon dioxide released to the atmosphere is equal or smaller than the carbon dioxide absorbed, therefore eliminating answers A and B. Unfortunately, many capable candidates chose these options, making this question a bad discriminator. The ocean is by far the largest sink.

Syllabus sections

Core » Topic 4: Ecology » 4.3 Carbon cycling

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