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20.3. Pollution
A subsection of Biology, 0610, through 20. Human influences on ecosystems
Listing 10 of 168 questions
Choose words or phrases from the list to complete the sentences about the enhanced greenhouse effect. Each word or phrase may be used once, more than once or not at all. carbon dioxide carbon monoxide deforestation flooding egestion methane nitrogen photosynthesise respire water vapour The enhanced greenhouse effect leads to climate change. One reason for this increased effect is that many trees are cut down. Cutting down large areas of trees is called . When trees are cut down they cannot and so the concentration of in the atmosphere increases. Another gas that increases the greenhouse effect is . Describe two reasons why humans cut down trees. An increase in some greenhouse gases is one undesirable effect of cutting down trees. State two other examples of these undesirable effects.
0610_m17_qp_32
THEORY
2017
Paper 3, Variant 2
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For Examiner's Use Carbon dioxide and methane are two important greenhouse gases. The effect of human activities in increasing the concentration of greenhouse gases, such as carbon dioxide and methane, is known as the enhanced greenhouse effect. shows the concentrations of carbon dioxide and methane in the atmosphere over the past 1000 years. year concentration of carbon dioxide in the atmosphere / parts per million year 2.00 1.75 1.50 1.25 1.00 0.75 concentration of methane in the atmosphere / parts per million For Examiner's Use Using information in , describe the trend in the concentrations of carbon dioxide and methane over the past 1000 years. Suggest and explain reasons for the trend in the concentrations of carbon dioxide and methane that you described in . Explain how gases, such as those shown in , contribute to the greenhouse effect. For Examiner's Use People are encouraged to recycle materials, such as paper and plastics. Discuss the advantages of recycling materials, such as paper and plastics.
0610_s10_qp_32
THEORY
2010
Paper 3, Variant 2
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For Examiner's Use Carbon dioxide and methane are two important greenhouse gases. The effect of human activities in increasing the concentration of greenhouse gases, such as carbon dioxide and methane, is known as the enhanced greenhouse effect. shows the concentrations of carbon dioxide and methane in the atmosphere over the past 1000 years. year concentration of carbon dioxide in the atmosphere / parts per million year 2.00 1.75 1.50 1.25 1.00 0.75 concentration of methane in the atmosphere / parts per million For Examiner's Use Using information in , describe the trend in the concentrations of carbon dioxide and methane over the past 1000 years. Suggest and explain reasons for the trend in the concentrations of carbon dioxide and methane that you described in . Explain how gases, such as those shown in , contribute to the greenhouse effect. For Examiner's Use People are encouraged to recycle materials, such as paper and plastics. Discuss the advantages of recycling materials, such as paper and plastics.
0610_s10_qp_33
THEORY
2010
Paper 3, Variant 3
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is an incomplete diagram of the carbon cycle. carbon dioxide in the air respiration respiration bacteria & fungi animals plants coal formation of fossil fuels Complete the word equation for aerobic respiration. + carbon dioxide + Name the processes 1, 2, 3, 4 and 5 shown in . Write your answers in Table 3.1. Table 3.1 number name of process shows a newspaper headline about global warming. GLOBAL DISASTER AHEAD Government spokesman announces that climates will change if we do not reduce the amount of greenhouse gases in the atmosphere. Scientists have shown that the amounts of carbon dioxide and methane in the atmosphere are continuing to rise. Explain two causes of the increase in the amount of carbon dioxide in the atmosphere. cause explanation cause explanation Suggest one action which governments might take to reduce the amount of greenhouse gases in the atmosphere.
0610_s14_qp_23
THEORY
2014
Paper 2, Variant 3
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Questions Discovered
168