IB ESS SL 2.3.6 Ecosystems As Carbon Stores Sinks Sources Questions

Distinguish carbon stores, sinks and sources using evidence from ecosystems.

Exam points

calculate and interpret differences in ecosystem carbon storage from treatment or food-web data, distinguishing a carbon store from net sink/source claims unless photosynthesis and respiration evidence is given

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Study 2.3.6—Ecosystems as carbon stores/sinks/sources conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Figure A simplified food web in a kelp forest ecosystem

Figure Kelp forest ecosystems with and without the presence of sea otters

The arrows indicate the flow of carbon between the atmosphere and the carbon stored in kelp.

Calculate the difference between carbon stored in kelp in the ecosystem with and without sea otters.

$180\left(\mathrm{~g} \mathrm{C} \mathrm{m}^{-2}\right)-14\left(\mathrm{~g} \mathrm{C} \mathrm{m}^{-2}\right)=166\left(\mathrm{~g} \mathrm{C} \mathrm{m}^{-2}\right)$ ;

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IB ESS SL 2.3.6 Ecosystems As Carbon Stores Sinks Sources Questions question 1