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9.3 Material cycles and decomposition

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Question 34

Two equal samples of dead flower petals each had an initial dry mass of 28 g. They were kept at the same temperature and moisture level for 16 days. Air could circulate around the petals in Tray A. Tray B was covered so that little air could reach the petals.

TrayDry mass after 16 days (g)
A20
B24
a.

Calculate the mean rate of decay in each tray. Give your answers in g d⁻¹.

[2]
b.

Explain why the mean rate of decay was greater in Tray A.

[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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