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7.3 Biodiversity and the effect of human interaction on ecosystems

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Question 19
H

Tropical forest is cut down and the land is used to grow crops for biofuels.

Why can this increase the carbon dioxide concentration of the atmosphere, even though the biofuel crops photosynthesise?

[1]
A

Biofuel crops cannot photosynthesise in tropical soil, so they remove no carbon dioxide at all

B

Burning biofuels releases methane rather than carbon dioxide, and methane traps more heat

C

Biofuel crops absorb more carbon dioxide than trees do, so the soil must release the extra carbon

D

The crops store far less carbon than the trees removed, and the trees are burned or decayed

Markscheme

7.3 Biodiversity and the effect of human interaction on ecosystems Questions

  1. GCSE
  2. /Biology
  3. /7.3 Biodiversity and the effect of human interaction on ecosystems

40 exam-style questions on AQA GCSE Biology 7.3 Biodiversity and the effect of human interaction on ecosystems, covering 7.3.1 Biodiversity, 7.3.2 Waste management, 7.3.3 Land use, 7.3.4 Deforestation, 7.3.5 Global warming, and 7.3.6 Maintaining biodiversity. Each one has a worked solution and a mark scheme showing where the marks go.

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