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4.1 Ecosystems

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Question 28
H

An area of forest is burned and is not replanted.

Which statement explains two ways that this increases the concentration of carbon dioxide in the atmosphere?

[1]
A

Combustion absorbs carbon dioxide, and more decomposers release carbon dioxide in respiration.

B

Respiration by the trees stops, and more trees take in carbon dioxide for photosynthesis.

C

Combustion releases oxygen, and fewer trees take in carbon dioxide for respiration.

D

Combustion releases carbon dioxide, and fewer trees take in carbon dioxide for photosynthesis.

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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