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9.3 Material cycles and decomposition

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Question 9

A survey of a drainage channel records bloodworms, sludgeworms, freshwater shrimps and stonefly nymphs before and after organic waste enters the water.

Which change would best support the conclusion that the water had become less oxygenated?

[1]
A

More stonefly nymphs and fewer freshwater shrimps

B

More bloodworms and fewer stonefly nymphs

C

Fewer bloodworms and more stonefly nymphs

D

More freshwater shrimps and fewer sludgeworms

Markscheme

9.3 Material cycles and decomposition Questions

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

101 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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