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The assessment focuses on core biology topics through short multiple-choice items, diagrams, and conceptual application. Learners answer questions covering potato sucrose concentration experiments, pond ecology and acidity, DNA structure recognition, enzyme active sites, polymers versus non-polymers, eye focusing and lens thickness, eye switching mechanics, food tests, kidney tubules, respiration versus photosynthesis energy changes, scientific conversions, organelle abundance comparisons, exercise-related urine changes, parthenocarpy hormones, and thyroid negative feedback. 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Do not write in the barcodes. |  |  |  |\n| --- | --- | --- | --- |\n| Centre number |  | Candidate number |  |\n| First name(s)  \u003Cbr>Last name   |  |  |  |\n\n*7705793651*  \nINSTRUCTIONS  \n• Use black ink. You may use an HB pencil for graphs and diagrams.  \n• Answer all the questions.  \n• Where appropriate, your answers should be supported with working. Marks may be given for a correct method even if the answer is incorrect.  \n• Write your answer to each question in the space provided. If additional space is required, use the lined page(s) at the end of this booklet. The question number(s) must be clearly shown.  \nINFORMATION  \n• The total mark for this paper is 90.  \n• The marks for each question are shown in brackets [ ] .  \n• Quality of extended response will be assessed in questions marked with an asterisk (*) .  \n• This document consists of 32 pages.  \n© OCR 2019 [601/8589/2] DC (SC/TP) 173759/6  \nOCR is an exempt Charity  \nTurn over  \n2  \nSECTION A  \nAnswer all the questions.  \nYou should spend a maximum of 30 minutes on this section.  \nWrite your answer to each question in the box provided.  \n1 An experiment is carried out to find the concentration of potato tissue.  \nFour chips are cut from a potato.  \nAt the start, each chip is 50 mm long, 10 mm wide and 10 mm high. Each chip is put in a different sucrose solution A, B, C and D. The volumes of the chips are calculated after 1 hour.  \n\n| Sucrose solution | Volume of chip (mm3) |\n| --- | --- |\n| A | 50 |\n| B | 500 |\n| C | 5000 |\n| D | 50 000 |\n\nWhich sucrose solution has the same concentration as the potato tissue?  \nYour answer  \n[1]  \n3  \n2 Pond snails and pondweed are living in water in sealed test tubes.  \n1 2 3 4  \npond water  \npond snail  \npondweed  \nsunlight  \nsunlight  \nsunlight  \nsunlight  \nCarbon dioxide dissolves in water and forms an acid.  \nIn which test tube would the water become most acidic?  \nA 1  \nB 2  \nC 3  \nD 4  \nYour answer  [1]  \n3 Which structure most closely resembles DNA?  \nA B C D  \nYour answer  \n[1]  \n© OCR 2019 Turn over  \n4  \n4 Look at the model of enzyme activity.  \nB C  \nA  \nD  \nWhich label represents the active site of an enzyme?  \nYour answer [1]  \n5 Which biological molecule is not a polymer?  \nA Amylase  \nB DNA  \nC Nucleotide  \nD Starch  \nYour answer [1]  \n6 Which condition can be caused by a lens in the eye that is too thick?  \nA Long-sightedness  \nB Colour blindness  \nC Diabetes  \nD Short-sightedness  \nYour answer [1]  \n5  \n7 The eye switches from focusing on a distant television to focusing on a close up newspaper. Which change happens to the suspensory ligaments and to the lens during this switch?  \n\n|  | Suspensory ligaments | Lens |\n| --- | --- | --- |\n| A | slack to tight | thicker |\n| B | slack to tight | thinner |\n| C | tight to slack | thicker |\n| D | tight to slack | thinner |\n\nYour answer  \n[1]  \n© OCR 2019 Turn over  \n6  \n8 The diagram shows positive results in two different food tests.  \nTube 1 Tube 2  \nFood sample plus reagent:  \nTreatment : shake thoroughly  \nboil in water-bath for 3 minutes  \nObservation : black colour  \norange precipitate  \nWhat do the results show in each tube?  \n\n|  | Tube 1 | Tube 2 |\n| --- | --- | --- |\n| A | sugar | lipid |\n| B | starch | sugar |\n| C | protein | sugar |\n| D | starch | protein |\n\nYour answer  \n[1]  \n7  \n9 The diagram shows part of a kidney tubule (nephron) .  \nB  \nD  \nWhich structure is the proximal convoluted tubule?  \nYour answer  [1]  \n10 Aerobic respiration occurs all the time in plant cells but photosynthesis only occurs in daylight.  \nWhy is more energy released by a plant cell during the night?  \nA Photosynthesis is endothermic taking in energy and aerobic respiration is exothermic.  \nB Photosynthesis is exothermic taking in energy and aerobic respiration is endothermic.  \nC A","cbCaim7pIAuYtW8N","https://ap.wps.com/l/cbCaim7pIAuYtW8N","pdf",1498507,32,"English","# SECTION A\n## Questions 1-15\n# SECTION B\n## Questions 16 onward","[{\"question\":\"What subjects and level does this paper cover?\",\"answer\":\"It covers GCSE Biology A (Gateway Science) at Higher Tier level, with an OCR question paper format for the afternoon session.\"},{\"question\":\"How many total marks are available and how are marks indicated?\",\"answer\":\"The total mark for the paper is 90, and the marks for each question are shown in brackets [ ].\"},{\"question\":\"What types of questions are included in the paper?\",\"answer\":\"The paper includes short answer and multiple-choice questions based on experiments, diagrams, and biological concepts, with some questions assessing quality of extended response when marked with an asterisk (*).\"}]","GCSE Biology A (Gateway Science) Paper 3 (Higher Tier) | PDF",81]