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9.3 Material cycles and decomposition

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Question 10
H

A student finds abundant bloodworms and sludgeworms in a stream, but no stonefly nymphs.

Which conclusion is best supported by these observations?

[1]
A

The stream may be unpolluted with a high oxygen concentration.

B

The stream may be unpolluted with a low oxygen concentration.

C

The stream may be organically polluted with a low oxygen concentration.

D

The stream may be organically polluted with a high oxygen concentration.

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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