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9.3 Material cycles and decomposition

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Question 25
H

A soil becomes waterlogged. Oxygen availability decreases. Nitrifying bacteria require oxygen, while denitrifying bacteria are favoured by oxygen-poor conditions.

Which changes would together reduce the soil nitrate concentration?

[1]
A

Increased nitrate production and decreased conversion of nitrate to nitrogen gas

B

Increased nitrate production and increased conversion of nitrogen gas to ammonium

C

Decreased nitrate production and increased conversion of nitrate to nitrogen gas

D

Decreased nitrate production and increased conversion of nitrogen gas to ammonium

Markscheme

9.3 Material cycles and decomposition Questions

  1. GCSE
  2. /Biology
  3. /9.3 Material cycles and decomposition

44 exam-style questions on Edexcel GCSE Biology 9.3 Material cycles and decomposition, covering 9.3.1 Cycling of materials through ecosystems, 9.3.2 The carbon cycle, 9.3.3 The water cycle, 9.3.4 The nitrogen cycle, 9.3.5 Indicator species and pollution, 9.3.6 Decomposition in preservation and composting, and 9.3.7 Rate changes in decay of biological material. Each one has a worked solution and a mark scheme showing where the marks go.

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