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4.1 Ecosystems

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Question 12
H

A student wants to investigate the effect of water content on the rate of decomposition of grass cuttings.

She has:

  • fresh grass cuttings
  • plastic containers with small holes in the lids
  • a measuring cylinder and water
  • a balance
  • an incubator.
a.

Describe a method the student could use.

[4]
b.

Suggest why the student should measure the dry mass of the grass cuttings, not the fresh mass.

[2]
Markscheme

4.1 Ecosystems Questions

  1. GCSE
  2. /Biology
  3. /4.1 Ecosystems

111 exam-style questions on OCR GCSE Biology 4.1 Ecosystems, covering 4.1.1 Cycling of materials in ecosystems, 4.1.2 Microorganisms in cycling materials, 4.1.3 The carbon and water cycles, 4.1.4 Factors affecting decomposition, 4.1.5 Levels of organisation in an ecosystem, 4.1.6 Abiotic and biotic factors affecting communities, 4.1.7 Interdependence and competition, 4.1.8 Trophic levels, 4.1.9 Pyramids of biomass, and 4.1.10 Efficiency of biomass transfers. Each one has a worked solution and a mark scheme showing where the marks go.

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