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9.3 Material cycles and decomposition

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Question 8
F

A sample of leaves has an initial dry mass of 80 g. After 20 days, its dry mass is 50 g. What is the mean rate of dry mass loss?

[1]
A

1.5 g day−11.5\,\text{g day}^{-1}1.5g day−1

B

4.0 g day−14.0\,\text{g day}^{-1}4.0g day−1

C

2.5 g day−12.5\,\text{g day}^{-1}2.5g day−1

D

6.5 g day−16.5\,\text{g day}^{-1}6.5g day−1

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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