[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-208054-en":3,"doc-seo-208054-105":30,"detail-sidebar-cat-0-en-105":90},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},208054,1374391974468,"Eden","https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0",4,"Exam","GCSE Combined Science: Trilogy - Higher Tier Paper 1: Biology 1H Specimen 2018","Specimen GCSE Combined Science: Trilogy Higher Tier Paper 1 (Biology 1H) provides a full set of assessment questions and instructions for a 1 hour 15 minutes exam. Students must answer all questions in the spaces, perform rough work in the booklet, and follow presentation requirements. The paper allocates 70 marks across tasks on cell types and identification, magnification and real size calculations, photosynthesis word equation and investigation design, evidence from experimental results, and the effect of pH on amylase activity using given methods and data tables.","SPECIMEN MATERIAL  \nGCSE  \nCOMBINED SCIENCE: TRILOGY  \nHigher Tier Paper 1: Biology 1H  \nH  \nSpecimen 2018 Time allowed: 1 hour 15 minutes  \nMaterials  \nFor this paper you must have:  \n• a ruler  \n• a calculator.  \nInstructions  \n• Answer all questions in the spaces provided.  \n• Do all rough work in this book. Cross through any work you do not want to be marked.  \nInformation  \n• There are 70 marks available on this paper.  \n• The marks for questions are shown in brackets.  \n• You are expected to use a calculator where appropriate.  \n• You are reminded of the need for good English and clear presentation in your answers.  \n• When answering questions 02.2, 05.3 and 06.6 you need to make sure that your answer:‒ is clear, logical, sensibly structured  \n‒ fully meets the requirements of the question  \n‒ shows that each separate point or step supports the overall answer.  \nAdvice  \n• In all calculations, show clearly how you work out your answer.  \n\n| Please write clearly, in block capitals. |  |  |  |  |\n| --- | --- | --- | --- | --- |\n| Centre number |  | | Candidate number | |\n| Surname | |  |  |  |\n| Forename(s)  Candidate signature   |  |  |  |  |\n\n0  1 Figure 1 shows four different types of cell.  \nFigure 1  \n0  1 . 1 Which cell is a plant cell?  \nGive one reason for your answer.  \n[2 marks]  \nCell    \nReason    \n0  1 . 2 Which cell is an animal cell?  \nGive one reason for your answer.  \n[2 marks]  \nCell    \nReason    \n0  1 . 3 Which cell is a prokaryotic cell?  \nGive one reason for your answer.  \n[2 marks]  \nCell    \nReason    \n0  1 . 4 A scientist observed a cell using an electron microscope.  \nThe size of the image was 25 mm.  \nThe magnification was × 100 000  \nCalculate the real size of the cell.  \nUse the equation:  \nGive your answer in micrometres.  \n[3 marks]  \n\n|  |\n| --- |\n|  |\n\nReal size =   micrometres  \nTurn over for the next question  \n0  2 Plants absorb light to photosynthesise.  \n0  2 . 1 What is the correct word equation for photosynthesis?  \n[ 1 mark]  \nTick one box.  \n0  2 . 2 Figure 2 shows some of the apparatus that can be used to measure the rate of photosynthesis.  \nFigure 2  \nThe rate of photosynthesis in the pondweed is affected by different colours of light.  \nDescribe a method you could use to investigate this.  \nYou should include:  \n• what you would measure  \n• variables you would control.  \n[6 marks]  \n\n|  |\n| --- |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n|  |\n\nQuestion 2 continues on the next page  \nA scientist carried out a similar investigation. Her results are shown in Figure 3.  \nFigure 3  \n0  2 . 3 The scientist said:  \n‘Light stops being a limiting factor at a light intensity of 20 units.’  \nGive evidence from Figure 3 to support this statement.  \n[ 1 mark]  \n|  |\n| --- |\n|  |\n\n0  2 . 4 What could be limiting the rate of photosynthesis at a light intensity of 25 units?  \nGive one factor.  \n[ 1 mark]  \nTurn over for the next question  \n0  3 Amylase is an enzyme that digests starch.  \nA student investigated the effect of pH on the activity of amylase.  \nThis is the method used.  \n1. Mix amylase solution and starch suspension in a boiling tube.  \n2. Put the boiling tube into a water bath at 25 °C.  \n3. Remove a drop of the mixture every 30 seconds and test it for the presence of starch.  \n4. Repeat the investigation at different pH values.  \nTable 1 shows the students’ results.  \nTable 1  \n| pH | Time when no starch was detected in minutes |\n| --- | --- |\n| 5.0 | 7.0 |\n| 5.5 | 4.5 |\n| 6.0 | 3.0 |\n| 6.5 | 2.0 |\n| 7.0 | 1.5 |\n| 7.5 | 1.5 |\n| 8.0 | 2.0 |\n\n0  3 . 1 The student concluded pH 7.25 was the optimum pH for the amylase enzyme.  \nThis is not a valid conclusion.  \nSuggest two reasons why.  \n[2 marks]  \n1    \n2  \nQuestion 3 continues on the next page  \nThe student did another investigation.  \nThis is the method used.  \n1. Put amylase solution and starch suspension into a boiling tube.  \n2. Make the pH 7.25.  \n3. Put the boiling tube into a water bath at 25 °C.  \n4. ","cbCaikD7J32wS5tW","https://ap.wps.com/l/cbCaikD7J32wS5tW","pdf",534059,1,24,"English","en",105,"# Higher Tier Paper 1: Biology 1H\n## Questions 0.1.1-0.1.4: Cell types and electron microscope calculation\n## Question 0.2.1-0.2.4: Photosynthesis word equation and investigation\n## Question 0.3.1-0.3.4: Amylase activity and pH experiments","[{\"question\":\"How long is the exam and how many marks are available?\",\"answer\":\"The time allowed is 1 hour 15 minutes, and there are 70 marks available on the paper.\"},{\"question\":\"What is required when answering specific questions 02.2, 05.3 and 06.6?\",\"answer\":\"Your answer must be clear, logical, sensibly structured, fully meet the question requirements, and show how each separate point or step supports the overall answer.\"},{\"question\":\"What experimental factors are considered in the amylase investigation?\",\"answer\":\"The investigation studies the effect of pH on amylase activity, using a controlled temperature (25 °C) and timed testing to determine when no starch is detected, then measuring sugar production in a follow-up method.\"}]","GCSE Combined Science: Trilogy - 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