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9.3 Material cycles and decomposition

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Question 16
F

A compost heap becomes waterlogged and decomposition slows. A gardener turns the heap and mixes in dry plant material.

Which explanation accounts for the increase in decomposition rate?

[1]
A

Water content increases, allowing more photosynthesis by decomposers.

B

Air spaces decrease, allowing more aerobic respiration by decomposers.

C

Air spaces increase, allowing more aerobic respiration by decomposers.

D

Water content decreases, allowing more photosynthesis by decomposers.

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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