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Section A focuses on multiple-choice topics including photosynthesis versus respiration, stomata effects on water loss, transpiration conditions, xylem adaptations, osmosis, hormone control of fruit ripening and reproductive cycles, chromosomes, cellular organelles, and DNA/cell-cycle questions. 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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*8991835482*  \nINSTRUCTIONS  \n• Use black ink. You can use an HB pencil, but only for graphs and diagrams.  \n• Write your answer to each question in the space provided. If you need extra space use the lined pages at the end of this booklet. The question numbers must be clearly shown.  \n• Answer all the questions.  \n• Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong.  \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 has 28 pages.  \nADVICE  \n• Read each question carefully before you start your answer.  \n© OCR 2022 [601/8589/2] DC (MB/FC) 320449/7 R  \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 Which row shows the correct type of reaction for photosynthesis and for respiration?  \n\n|  |  | Photosynthesis | Respiration |\n| --- | --- | --- | --- |\n| Type of Reaction | A | endothermic | endothermic |\n|  | B | exothermic | exothermic |\n|  | C | endothermic | exothermic |\n|  | D | exothermic | endothermic |\n\nYour answer  \n[1]  \n3  \n2 The diagram shows a potometer.  \nWater  \nTap  \nNarrow tube  \nWater  \n0 1 2 3 4 5 6 7 8 9 10 Gas bubble  \nA student wants to test the hypothesis that the number of stomata on a plant affects water loss. They first record the distance the gas bubble moves in 10 minutes.  \nWhat should the student do next before taking a second reading to test this hypothesis? A Cover the plant with a black plastic bag.  \nB Remove some of the leaves.  \nC Repeat the test in a warmer room.  \nD Use an electric fan to move the air.  \nYour answer  \n[1]  \n3 Transpiration will occur fastest in which conditions? A A cold and windy environment  \nB A dark and cold environment  \nC A dark and warm environment  \nD A warm and windy environment  \nYour answer  \n[1]  \n© OCR 2022 Turn over  \n4  \n4 Which adaptation of xylem helps prevent water leaving the xylem vessels?  \nA Lignin in the walls of the xylem  \nB Pits (holes) in the walls of the xylem  \nC The breakdown of cross walls between cells that make up the xylem  \nD The lack of cell contents in the cells that make up the xylem  \nYour answer  [1]  \n5 Water moves into root hair cells due to differences in water potentials.  \nWhich term describes this process?  \nA Active transport  \nB Diffusion  \nC Osmosis  \nD Translocation  \nYour answer  [1]  \n6 Which hormone should be used to ripen fruit?  \nA Ethene  \nB FSH  \nC Gibberellins  \nD Thyroxine  \nYour answer  [1]  \n5  \n7 An elephant has 56 chromosomes in a stomach cell.  \nHow many chromosomes will there be in an elephant’s ear cell?  \nA 23  \nB 28  \nC 56  \nD 112  \nYour answer  [1]  \n8 Liver cells are active cells producing many protein molecules.  \nWhich organelles are present in liver cells?  \nA Chloroplasts and mitochondria  \nB Mitochondria and plasmids  \nC Nuclei and ribosomes  \nD Ribosomes and plasmids  \nYour answer  [1]  \n9 A student cuts a cube of potato to use in an experiment. Each face of the cube is 2 cm by 2 cm. What is the surface area : volume ratio of the cube?  \nA 3 : 1  \nB 4 : 8  \nC 8 : 24  \nD 16 : 8  \nYour answer  \n[1]  \n© OCR 2022 Turn over  \n6  \n10 Farmers can control a cow’s menstrual cycle using hormones.  \nHormones controlling the menstrual cycle of a cow are the same as those in humans.  \nWhich hormone would a farmer use to stimulate egg production?  \nA F","cbCaigwmsW80iRGq","https://ap.wps.com/l/cbCaigwmsW80iRGq","pdf",1278043,28,"English","# Instructions\n# Section A\n## Multiple choice questions (1-15)\n# Section B","[{\"question\":\"What are the key instructions for answering the paper?\",\"answer\":\"Use black ink, write answers in the spaces provided, and answer all questions. Read each question carefully and show working where appropriate for marks based on method.\"},{\"question\":\"How many marks does the paper award in total?\",\"answer\":\"The total mark for the paper is 90.\"},{\"question\":\"Which topics are covered in Section A?\",\"answer\":\"Section A covers multiple-choice questions on photosynthesis and respiration, potometer and transpiration, xylem adaptations, osmosis, hormones, chromosomes, liver cell organelles, surface area to volume, and DNA/cell-cycle concepts.\"}]","Oxford Cambridge and RSA Tuesday 17 May 2022 - Morning GCSE (9-1) Biology A (Gateway Science) - Paper 3 (Higher Tier) | PDF",71]