IB Biology HL 4.2.18 Carbon fluxes and global carbon budgets Question Bank

Practise IB Biology HL 4.2.18 by analysing global carbon budgets and evidence for changing carbon flux.

Exam points

Interpret carbon-budget data to identify positive and negative fluxes.
Evaluate how peat, ocean fertilisation and long-term trends affect atmospheric CO2.

[Maximum number: 2]

The graph shows carbon dioxide ( $\mathrm{CO}_{2}$ ) concentration in the atmosphere during the past 800000 years. The data was produced by measuring the $\mathrm{CO}_{2}$ concentration of air bubbles trapped in cores of Antarctic ice.

Figure for Question C4.2.18—Carbon sinks and sources question 1 — IB Biology HL

The graph shows long-term fluctuations in atmospheric $\mathrm{CO}_{2}$ concentration of about 80 ppm . The decreases in $\mathrm{CO}_{2}$ concentration are probably due to oceans acting as a sink by holding large quantities of dissolved $\mathrm{CO}_{2}$ .

Identify two other examples of natural sinks that can remove carbon from the carbon cycle and reduce atmospheric $\mathrm{CO}_{2}$ concentration.

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C4.2.18—Carbon sinks and sources question 1