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Nutrient cycles (A-level only)

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Question 1

Figure 1 shows part of a phosphorus cycle, including the mass of phosphorus in two stores.

Diagram of part of a phosphorus cycle showing two stores of phosphorus that supply a central reservoir called Soil. On the left is a box representing terrestrial vegetation containing a phosphorus store of 4.5 \times 10^3 Tg; an arrow leads from this box to Soil with the label '0.08% Runoff and decomposition'. On the right is a box representing deep rocks and minerals containing a phosphorus store of 3 \times 10^{11} Tg; an arrow leads from this box to Soil with the label '8.5 \times 10^{-9}% Slow weathering'.

One teragram (Tg) is 1×10121 \times 10^{12}1×1012 grams.

The supply of phosphorus to the soil is shown as a percentage of the total phosphorus mass of each store.

Calculate in teragrams the difference in the supply of phosphorus to the soil from the two stores shown in Figure 1.

Show your working.

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Nutrient cycles (A-level only) Questions

  1. A Level
  2. /Biology
  3. /Nutrient cycles (A-level only)

Practise AQA A Level Biology Nutrient cycles (A-level only) with exam-style questions for A Level Biology. 6 questions, matched to the AQA A Level Biology (7402) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank