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9.3 Material cycles and decomposition

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Question 1

A park pond contains freshwater shrimps. A large amount of pondweed dies, and decomposers begin to break it down.

A pump is used to bubble air through the water, increasing the dissolved-oxygen concentration.

Explain how using the pump could affect the survival of the freshwater shrimps while the pondweed is decomposing.

[2]
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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