Biology > MARK SCHEME > Mark Scheme (Results) Summer 2022 Pearson Edexcel International GCSE In Biology (4BI1) Paper 2B (All)

Mark Scheme (Results) Summer 2022 Pearson Edexcel International GCSE In Biology (4BI1) Paper 2B

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Question Number Answer Mark 1 (a)(i) methane / nitrous oxides / CFCs / water vapour / eq (1) Accept other correct named greenhouse gases Reject carbon monoxide 1 Question Number Answer Add... itional guidance Mark 1 (a)(ii) 1.8 x 1013 (3) Accept 18 000 000 000 000 or 18 trillion for two marks Accept 18 x 1012 for two marks Accept 18 or (727 + 37 - 746) or 18 with other incorrect standard form for one mark Example of calculation:  727 + 37 - 746 = 18  x 1 000 000 000 000  conversion to standard form 3Question Number Answer Additional guidance Mark 1 (a)(iii) An answer that makes reference to two of the following.  ice (caps) melt / glaciers melt / eq (1)  flooding / sea level rises / eq (1)  loss of habitat / desertification / droughts (1)  extinctions / disrupted food chains / migration of species / damaged ecosystems / decreased plant yields / decreased productivity / eq (1)  destruction of coral reefs / coral bleaching / eq (1)  spread of disease / pests / pathogens / eq (1)  extreme weather / climate change / changes in weather patterns / eq (1) [Show More]

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