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The exam includes an investigation into how light intensity affects the rate of photosynthesis using pondweed, requiring identification of the correct photosynthesis equation, selection of the independent variable, calculation of reaction rate from tabulated data, plotting results with a line of best fit, and prediction for an untested distance. It also tests understanding of exothermic reactions and interpreting practical chemistry procedures, including food tests for protein, starch and sugar.",{"@graph":69,"@context":108},[70,84,99],{"@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-biology-paper-1h-higher-tier-exam-questions-june-2021/207466/",{"url":83,"name":65,"@type":85,"author":86,"headline":65,"publisher":89,"fileFormat":92,"inLanguage":63,"description":67,"dateModified":93,"datePublished":93,"encodingFormat":92,"isAccessibleForFree":94,"interactionStatistic":95},"DigitalDocument",{"name":87,"@type":88},"Putri","Person",{"url":74,"name":90,"@type":91},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":96,"interactionType":97,"userInteractionCount":4},"InteractionCounter",{"@type":98},"ViewAction",{"@type":100,"mainEntity":101},"FAQPage",[102],{"name":103,"@type":104,"acceptedAnswer":105},"How can a food sample be tested for protein, starch and sugar?","Question",{"text":106,"@type":107},"Use the appropriate standard chemical tests for each macronutrient and record the observed colors to indicate whether protein, starch, and sugar are present.","Answer","https://schema.org",{"og:url":83,"og:type":110,"og:title":65,"og:site_name":90,"og:description":67},"article",{"robots":112,"canonical":83},"index,follow",{"doc_id":114,"site_id":62},207466,1788599701,{"code":4,"msg":5,"data":117},{"doc_id":114,"user_id":118,"nickname":87,"user_avatar":119,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":120,"file_id":121,"file_url":122,"file_type":123,"file_size":124,"view_count":4,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":125,"language":126,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":127,"faqs":128,"seo_title":129,"seo_description":67,"update_tm":115,"read_time":130},962085571259,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","| Please write clearly in block capitals. |  |  |  |\n| --- | --- | --- | --- |\n| Centre number |  | Candidate number |  |\n| Surname  \u003Cbr>Forename(s)  \u003Cbr>Candidate signature  \u003Cbr>I declare this is my own work. |  |  |  |\n\nGCSE  \nCOMBINED SCIENCE: TRILOGY  \nHigher Tier  \nBiology Paper 1 H  \nH  \nTime allowed: 1 hour 15 minutes  \nMaterials  \nFor this paper you must have:  \n• a ruler  \n• a scientific calculator.  \nInstructions  \n• Use black ink or black ball-point pen.  \n• Pencil should only be used for drawing.  \n• Fill in the boxes at the top of this page.  \n• Answer all questions in the spaces provided.  \n• If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s) .  \n• Do all rough work in this book. Cross through any work you do not want to be marked.  \n• In all calculations, show clearly how you work out your answer.  \n\n| For Examiner’s Use |  |\n| --- | --- |\n| Question | Mark |\n| 1 |  |\n| 2 |  |\n| 3 |  |\n| 4 |  |\n| 5 |  |\n| 6 |  |\n| TOTAL |  |\n\nInformation  \n• The maximum mark for this paper is 70.  \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*jun218464b1h01*  \nIB/M/Jun21/E7  \n8464/B/1H  \n\n| 0  1 Plants absorb light for photosynthesis.\u003Cbr>|\n| --- |\n| 0 1 . 1\u003Cbr>Which is the equation for photosynthesis? Tick ( 􀀹 ) one box.\u003Cbr>C6 H 12O6 + 6 O2 → 6 CO2 + 6 H2O\u003Cbr>6 CO2 + 6 H2O → C6 H 12O6 + 6 O2\u003Cbr>6 H2O + 6 O2 → C6 H 12O6 + 6 CO2\u003Cbr>6 O2 + 6 CO2 → C6 H 12O6 + 6 H2O\u003Cbr>\u003Cbr>[1 mark] |\n| A student investigated the effect of light intensity on the rate of photosynthesis.\u003Cbr>Figure 1 shows the apparatus.\u003Cbr>Figure 1\u003Cbr>|\n\nDo not write outside the box  \nThis is the method used.  \n1. Set up the apparatus as shown in Figure 1.  \n2. Place the pondweed 10 cm away from the lamp.  \n3. Switch on the lamp.  \n4. Record the number of bubbles of gas produced in 5 minutes.  \n5. Repeat steps 2 to 4 with the pondweed at different distances from the lamp.  \n 0  1  .  2 What was the independent variable in this investigation?  \nTick ( 􀀹 ) one box.  \nDistance of the pondweed from the lamp Length of the piece of pondweed Number of bubbles of gas produced  \nTime taken to collect the gas  \n[1 mark]  \nQuestion 1 continues on the next page  \noutside the box  \nThe lamp gets warm when it is on. This causes the temperature of the water to increase.  \nExplain how an increase in temperature would affect the results of this investigation.  \n[2 marks]  \nSuggest one way the investigation could be improved so the temperature of the water does not increase.  \n[1 mark]  \nSuggest two improvements to the investigation so the results would be more valid.  \nDo not refer to controlling the temperature of the water.  \n[2 marks]  \n1    \n2  \n\n| 0 | 1 | . | 3 |\n| --- | --- | --- | --- |\n\n\n| 0 | 1 | . | 4 |\n| --- | --- | --- | --- |\n\n\n| 0 | 1 | . | 5 |\n| --- | --- | --- | --- |\n\noutside the box  \nQuestion 1 continues on the next page  \nDO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED  \noutside the box  \nTable 1 shows the results.  \nTable 1  \n\n| Distance of pondweed from the lamp in cm | Number of bubbles of gas produced in 5 minutes |\n| --- | --- |\n| 10 | 120 |\n| 20 | 56 |\n| 30 | 31 |\n| 40 | 16 |\n| 50 | 10 |\n\n\n| 0 | 1 | . | 6 |\n| --- | --- | --- | --- |\n\nCalculate the rate of photosynthesis when the pondweed was 40 cm from the lamp.  \nGive the rate of photosynthesis as the number of bubbles of gas produced per minute.  \n[1 mark]  \nRate =   bubbles of gas produced per minute  \nGive one conclusion that can be made from Table 1.  \n[1 mark]  \n\n| 0 | 1 | . | 7 |\n| --- | --- | --- | --- |\n\noutside the box  \n\n|  |  |  |  |  | Plot the data from Table 1 on Figure 2. | outside box |\n| --- | --- | --- | --- | --- | --- | --- |\n|  | 0 | 1 | . | 8 |  |  |\n| Draw a line of best fit.\u003Cbr>[3 marks]\u003Cbr>Figure 2\u003Cbr>|  |  |  |  |  |  |\n|  | 0 | 1 | . |","cbCaiqZreqkaNh5l","https://ap.wps.com/l/cbCaiqZreqkaNh5l","pdf",1842343,28,"English","# Photosynthesis\n## Photosynthesis equation\n## Independent variable\n## Effect of temperature and improving validity\n## Rate calculation and conclusions\n## Line of best fit and prediction\n# Testing food samples\n## Protein, starch and sugar color changes\n# Fermentation in yeast\n## Meaning of exothermic\n## Practical setup (temperature effect)","[{\"question\":\"How can a food sample be tested for protein, starch and sugar?\",\"answer\":\"Use the appropriate standard chemical tests for each macronutrient and record the observed colors to indicate whether protein, starch, and sugar are present.\"}]","GCSE Combined Science: Trilogy - Biology Paper 1H (Higher Tier) - Exam Questions June 2021 | PDF",71]