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9.3 Material cycles and decomposition

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Question 4
H

Which pair of organisms indicates clean, well-oxygenated freshwater?

[1]
A

Freshwater shrimps and sludgeworms

B

Freshwater shrimps and stonefly nymphs

C

Bloodworms and stonefly nymphs

D

Bloodworms and sludgeworms

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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