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Cycles within ecosystems

Cycles within ecosystems

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Question 5

Five key processes in the nitrogen cycle are:

  1. Nitrification
  2. Denitrification
  3. Assimilation by plant roots
  4. Leaching by rainwater
  5. Ammonification
a.

How many of these five processes directly decrease the amount of nitrate ions (NO3−\text{NO}_3^-NO3−​) in the soil?

[1]
b.

How many of these five processes directly increase the amount of nitrate ions (NO3−\text{NO}_3^-NO3−​) in the soil?

[1]
c.

Name one genus of bacteria primarily responsible for the process of nitrification.

[1]
Markscheme

Cycles within ecosystems Questions

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

12 exam-style questions on Edexcel IGCSE Biology Cycles within ecosystems. Each one has a worked solution and a mark scheme showing where the marks go.

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