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9.3 Material cycles and decomposition

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Question 8

A sample of dead seaweed had an initial dry mass of 96 g. After decomposition, 60 g of dry mass remained. The mean rate of decay during this period was 1.2 g day−11.2\,\text{g day}^{-1}1.2g day−1.

What is the time taken for this change in dry mass?

[1]
A

80 days80\,\text{days}80days

B

130 days130\,\text{days}130days

C

50 days50\,\text{days}50days

D

30 days30\,\text{days}30days

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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