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The paper then examines investigation design for photosynthesis rate using different light colours and interpreting experimental evidence. Later sections assess enzyme activity by testing pH effects on amylase, using timings, optimum pH evaluation, and a method to measure sugar production over time.",{"@graph":69,"@context":117},[70,84,100],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/gcse-combined-science-trilogy-higher-tier-paper-1-biology-1h-specimen-2018/207366/",{"url":83,"name":65,"@type":85,"author":86,"headline":65,"publisher":89,"fileFormat":92,"inLanguage":63,"description":67,"dateModified":93,"datePublished":94,"encodingFormat":92,"isAccessibleForFree":95,"interactionStatistic":96},"DigitalDocument",{"name":87,"@type":88},"Cipher","Person",{"url":74,"name":90,"@type":91},"DocShare","Organization","application/pdf","2026-09-06","2026-09-05",true,{"@type":97,"interactionType":98,"userInteractionCount":8},"InteractionCounter",{"@type":99},"ViewAction",{"@type":101,"mainEntity":102},"FAQPage",[103,109,113],{"name":104,"@type":105,"acceptedAnswer":106},"What materials and equipment are required for this specimen paper?","Question",{"text":107,"@type":108},"A ruler and a calculator are required. The paper also instructs students to do rough work in the book.","Answer",{"name":110,"@type":105,"acceptedAnswer":111},"How do you calculate the real size of a cell from magnification?",{"text":112,"@type":108},"Use the given equation and express the real size in micrometres, using the image size and the magnification provided.",{"name":114,"@type":105,"acceptedAnswer":115},"Why is pH 7.25 not a valid optimum pH conclusion in the amylase question?",{"text":116,"@type":108},"The conclusion is challenged because the results provided do not justify that exact optimum value, and the evidence needs to be supported by appropriate comparisons across the tested pH values.","https://schema.org",{"og:url":83,"og:type":119,"og:title":65,"og:site_name":90,"og:description":67},"article",{"robots":121,"canonical":83},"index,follow",{"doc_id":123,"site_id":62},207366,1788599321,{"code":4,"msg":5,"data":126},{"doc_id":123,"user_id":127,"nickname":87,"user_avatar":128,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":129,"file_id":130,"file_url":131,"file_type":132,"file_size":133,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":134,"language":135,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":136,"faqs":137,"seo_title":138,"seo_description":67,"update_tm":124,"read_time":26},687208528416,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","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. ","cbCaih0kkycbcS2I","https://ap.wps.com/l/cbCaih0kkycbcS2I","pdf",366229,24,"English","# Higher Tier Paper 1: Biology 1H\n## Cells and cell types\n## Photosynthesis and investigation methods\n## Amylase enzyme and pH effects","[{\"question\":\"What materials and equipment are required for this specimen paper?\",\"answer\":\"A ruler and a calculator are required. The paper also instructs students to do rough work in the book.\"},{\"question\":\"How do you calculate the real size of a cell from magnification?\",\"answer\":\"Use the given equation and express the real size in micrometres, using the image size and the magnification provided.\"},{\"question\":\"Why is pH 7.25 not a valid optimum pH conclusion in the amylase question?\",\"answer\":\"The conclusion is challenged because the results provided do not justify that exact optimum value, and the evidence needs to be supported by appropriate comparisons across the tested pH values.\"}]","GCSE Combined Science: Trilogy - Higher Tier Paper 1 Biology 1H - Specimen 2018 | PDF"]