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EXAMINATIONS  \nCambridge International Advanced Subsidiary and Advanced Level  \n9693/04 MARINE SCIENCE  \nPaper 4 A2 Data-Handling and Free-Response  \nMay/June 2018  \nTIME: 1 hour 15 minutes  \nSUITABLE FOR VISUALLY IMPAIRED CANDIDATES  \nCandidates answer on the Question Paper. No Additional Materials are required.  \nREAD INSTRUCTIONS OVERLEAF  \nDC (ST/CT) 162833/1  \nThe whole of this paper is © UCLES 2018.  \nREAD THESE INSTRUCTIONS FIRST  \nWrite your Centre number, candidate number and name on all the work you hand in.  \nWrite in dark blue or black pen.  \nYou may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES.  \nSECTION A  \nAnswer BOTH questions in this section.  \nWrite your answers in the spaces provided on the Question Paper.  \nSECTION B  \nAnswer BOTH questions in this section.  \nWrite your answers in the spaces provided on the Question Paper.  \nElectronic calculators may be used.  \nYou may lose marks if you do not show your working or if you do not use appropriate units.  \nAt the end of the examination, fasten all your work securely together.  \nThe number of marks is given in brackets [ ] at the end of each question or part question.  \nBLANK PAGE  \nSECTION A  \nAnswer BOTH questions in this section.  \n1 Scientists carried out an investigation into the  \ncomposition of water samples taken from an area of the Arctic Ocean.  \nThey measured the concentration of dissolved oxygen, and also the quantity of chlorophyll present in a 1 dm3 sample.  \nSampling was carried out on the first day of each month from late winter, through spring and into early summer.  \nThe condition of the surface ice on the water was also determined. It was assessed as increasing in size or melting.  \nThe results are shown in Table 1.1.  \n6  \nTABLE 1.1  \n\n| TIME\u003Cbr>(MONTH) | QUANTITY OF CHLOROPHYLL /ARBITRARY UNITS | OXYGEN CONCENTRATION\u003Cbr>/ mg dm–3 | CONDITION OF ICE SHEET |\n| --- | --- | --- | --- |\n| December | 1000 | 8.5 | increasing |\n| January | 500 | 8.5 | increasing |\n| February | 500 | 7.8 | increasing |\n| March | 500 | 6.9 | increasing |\n| April | 2000 | 7.6 | melting |\n| May | 6000 | 8.4 | melting |\n| June | 3000 | 8.6 | melting |\n| July | 1500 | 8.8 | melting |\n\n(a) Plot a graph to show the changes in quantity of chlorophyll and oxygen concentration over time.  \n\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |\n\n[5]  \n(b) (i) Explain the relationship between the quantity of chlorophyll and the oxygen concentration shown in Table 1.1 and your graph.  \n\n|  |\n| --- |\n|  |\n|  |\n\n   [2]  \n(ii) Use the information in Table 1.1 to suggest TWO explanations, other than the changes in the quantity of chlorophyll, for the changes in oxygen concentration.  \n\n|  |\n| --- |\n|  |\n\n   [2]  \n(c) It has been suggested that global warming could affect ocean productivity.  \nUse the information in Table 1.1 and your graph to suggest how ocean productivity could be affected.  \n\n|  |\n| --- |\n|  |\n|  |\n\n   [2]  \n[Total: 11]  \nBLANK PAGE","cbCailHGCIQ9XBKd","https://ap.wps.com/l/cbCailHGCIQ9XBKd","pdf",2349326,24,"English","# Section A\n## Question 1\n### (a) Graph of chlorophyll and oxygen over time\n### (b) Relationship and explanations for oxygen changes\n### (c) Global warming and ocean productivity\n# Section B\n## Question 1 (two questions required)","[{\"question\":\"What data are collected in the Arctic Ocean investigation?\",\"answer\":\"Researchers measure dissolved oxygen concentration and the quantity of chlorophyll in a 1 dm3 water sample, and assess the ice-sheet condition as increasing or melting.\"},{\"question\":\"What tasks are required in Section A question 1?\",\"answer\":\"Candidates must plot changes over time, explain the relationship between chlorophyll and oxygen, suggest two other explanations for oxygen changes, and use the data to propose how ocean productivity could be affected by global warming.\"},{\"question\":\"How is the sampling scheduled during the investigation?\",\"answer\":\"Sampling occurs on the first day of each month from late winter through spring into early summer.\"}]","9693/04 MARINE SCIENCE - Paper 4 A2 - Data-Handling and Free-Response | PDF"]