An area of tropical rainforest is cleared and the trees are burned. The land is then used to grow a crop that photosynthesises for only 6 months of each year. Which explains why the carbon dioxide concentration of the air rises over a whole year?
Burning releases methane and the crop photosynthesises for only part of the year
Burning releases carbon dioxide and the crop photosynthesises for part of the year
Burning releases methane and the crop respires faster than the trees it replaced
Burning releases carbon dioxide and the crop respires faster than the trees did
49 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.