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4.1 Ecosystems

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Question 5
F

A gardener makes compost from garden waste in a plastic bin.

  • The bin has a lid and small holes in its sides.
  • The bottom of the bin is open, so the waste sits directly on the soil.
a.

Explain how the holes in the sides of the bin increase the rate of decomposition.

[3]
b.

The gardener adds water to the compost when it becomes dry.

Explain why.

[2]
c.

The gardener cuts the garden waste into small pieces before putting it in the bin.

Suggest why this increases the rate of decomposition.

[2]
d.

Explain how spreading the compost on soil helps plants to grow.

[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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