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It includes questions on barley seed planting and graph trends, the impact of competition for resources such as light, and comparison of bacterial and animal cells. 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Do not write with a gel pen.\u003Cbr>Answer all nine questions.\u003Cbr>\u003Cbr>INFORMATION FOR CANDIDATES\u003Cbr>The total mark for this paper is 75.\u003Cbr>Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each question or part question.\u003Cbr>Quality of written communication will be assessed in Question 8(b) . |  |  |  |\n|  13841 | |  |  |\n\n*28GBL1201*  \n*28GBL1201*  \n1 The diagram shows a section through an eye.  \nSource: © Science Photo Library  \n(a) Name parts A, B and C.  \nA    \nB    \nC   [3]  \n 13841  \n*28GBL1202*  \n*28GBL1202*  \nThe diagram shows light rays from an object entering the eye through the pupil.  \nlight rays from object  \nSource: © Science Photo Library  \n(b) Use the diagram to explain how we see an image of an object.  \n[4]  \n 13841  \n[Turn over  \n*28GBL1203*  \n*28GBL1203*  \n\n| | 2 Scientists carried out an investigation into the mass of barley produced when different numbers of barley seeds were planted in test plots.\u003Cbr>The scientists planted different numbers of barley seeds per square metre in these test plots.\u003Cbr>They recorded the mass of barley produced in each test plot after six weeks.\u003Cbr>The graph shows their results. |  |  |  | |\n| --- | --- | --- | --- | --- | --- |\n| Mass of barley produced / kg per square metre |  | 5.0\u003Cbr>4.5\u003Cbr>4.0\u003Cbr>3.5\u003Cbr>3.0\u003Cbr>2.5\u003Cbr>2.0\u003Cbr>1.5\u003Cbr>1.0\u003Cbr>0.5\u003Cbr>0 | \u003Cbr>50 100 150 200 250 300 350 400 450 500 550 600 Number of barley seeds planted per square metre\u003Cbr>Source: Chief Examiner |  |  |\n|  13841 |  |  |  | |  |\n\n*28GBL1204*  \n*28GBL1204*  \n| | (a) Describe the trend shown by the results. Use data to support your answer. |  | |\n| --- | --- | --- | --- |\n| \u003Cbr>[4]\u003Cbr>(b) When the number of barley seeds planted per square metre was large, competition between the barley plants increased.\u003Cbr>One resource the barley plants compete for is light.\u003Cbr>(i) Suggest how competition for light caused the changes shown in the graph when more than 300 barley seeds were planted per square metre.\u003Cbr>  [2]\u003Cbr>(ii) Give two other resources the barley plants compete for.\u003Cbr>1  \u003Cbr>2   [2] |  |  |  |\n|  13841 |  | [Turn over\u003Cbr>\u003Cbr>|  |\n\n*28GBL1205*  \n*28GBL1205*  \n3 The diagram shows a bacterial cell.  \nSource: Chief Examiner  \n(a) Name parts A and B.  \nA    \nB   [2]  \n(b) Give two similarities and one difference between a bacterial cell and an animal cell.  \nSimilarity 1    \nSimilarity 2    \nDifference    \n  [3]  \n 13841  \n*28GBL1206*  \n*28GBL1206*  \nBLANK PAGE  \nDO NOT WRITE ON THIS PAGE  \n(Questions continue overleaf)  \n 13841  \n[Turn over  \n*28GBL1207*  \n*28GBL1207*  \n\n| | 4 (a) Mitochondria are cell structures which carry out aerobic respiration.\u003Cbr>(i) Where are mitochondria found in a cell?\u003Cbr>_______________________________\u003Cbr>(ii) Complete the balanced chemical equation for aerobic respiration. |  |  |  |  |  |  |  | [1]\u003Cbr>energy\u003Cbr>[2] | |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n|  | | + | 6O2 | 􀂭 | 6H2O | + | | + |  |  |\n| (b) The table shows the average number of mitochondria found in three different types of animal cell.\u003Cbr>Type of animal cell Average number of mitochondria per cell skin cell 150 surface cell of a villus in the ileum 1650 white blood cell 700\u003Cbr>Source: Chief Examiner\u003Cbr>The average number of mitochondria in a surface cell of a villus in the ileum is greater than in a skin cell.\u003Cbr>(i) Calculate how many times greater.\u003Cbr>Show your working.\u003Cbr>  times [2]","cbCairC8vZpK0wTh","https://ap.wps.com/l/cbCairC8vZpK0wTh","pdf",4413363,28,"English","# Question 1\n## Eye structure and vision\n# Question 2\n## Barley seed experiment and competition for light\n# Question 3\n## Bacterial cell structure and cell comparisons\n# Question 4\n## Mitochondria and aerobic respiration; active transport\n# Question 5\n## Global warming and related activity","[{\"question\":\"What must candidates do in this exam paper?\",\"answer\":\"Candidates must write answers in the provided spaces, answer all nine questions, and complete using black ink only. They must not write outside the boxed areas.\"},{\"question\":\"How are questions marked on this paper?\",\"answer\":\"The total mark is 75. Figures shown in brackets down the right-hand side indicate the marks for each question or part question.\"},{\"question\":\"What biological topics appear in the questions?\",\"answer\":\"Topics include parts of the eye and explaining how we see, interpreting results from a barley seed experiment, bacterial versus animal cell features, aerobic respiration and mitochondria, active transport in villus cells, and an activity contributing to global warming.\"}]","GCSE Biology Unit 1 - Higher Tier - Summer 2024 - Paper | PDF",71]