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Cycles within ecosystems

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Question 6

The diagram shows a simplified model of the terrestrial nitrogen cycle.

A diagram of the terrestrial nitrogen cycle with boxes for Atmospheric Nitrogen, Ammonium ions in soil, Nitrate ions in soil, and Organic nitrogen in plants/animals, with labeled arrows P, Q, and R representing key biological processes.

a.

Name the biological processes PPP, QQQ, and RRR shown in the diagram.

[3]
b.

Waterlogged soil has low oxygen concentrations, creating anaerobic conditions. Explain the consequences of waterlogged soil on process QQQ and the availability of nitrate ions in the soil.

[2]
c.

Describe how the excessive application of artificial nitrogen fertilizers can run off into nearby freshwater ecosystems and lead to eutrophication.

[4]

Cycles within ecosystems Questions

  1. IGCSE
  2. /Biology
  3. /Cycles within ecosystems