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9.3 Material cycles and decomposition

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Question 3

A food technologist compares equal portions of cheese. Both portions are stored at 5 °C. One portion is vacuum-packed and the other is exposed to air. The vacuum-packed portion decomposes more slowly.

Which explanation accounts for this difference?

[1]
A

Less oxygen is available, so aerobic decomposers respire more slowly.

B

Less water is available, so decomposer enzymes work more slowly.

C

Less carbon dioxide is available, so decomposers respire more slowly.

D

The cheese is kept colder, so decomposer enzymes work more slowly.

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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