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The paper totals 60 marks and is structured into Section A and Section B, assessing knowledge of stem cells, root tips, microscopy slide preparation, cell features, the reflex arc and motor neurones, contraceptive pill hormones, adrenaline effects, fertility timing in cows, and surface-area-to-volume reasoning, plus inverse square law calculations for light intensity. 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Do not write in the barcodes. |  |  |  |\n| --- | --- | --- | --- |\n| Centre number |  | Candidate number |  |\n| First name(s)  \u003Cbr>Last name   |  |  |  |\n\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 60.  \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 20 pages.  \nADVICE  \n• Read each question carefully before you start your answer.  \n© OCR 2022 [601/8687/2] DC (ST/CT) 300169/7  \nOCR is an exempt Charity  \nTurn over  \n2  \nSECTION A  \nAnswer all the questions.  \nYou should spend a maximum of 20 minutes on this section.  \nWrite your answer to each question in the box provided.  \n1 Which statement is true of both adult and embryonic stem cells?  \nA They are in all adult and embryonic tissues.  \nB They are only used to make blood cells.  \nC They can divide by mitosis.  \nD They cannot differentiate.  \nYour answer [1]  \n2 The diagram shows the root tip of a plant.  \nA  \nB  \nD  \nC  \nWhich label, A, B, C or D, identifies the position of stem cells in the root tip?  \nYour answer [1]  \n3  \n3 The diagram shows a student preparing some cells to view using a light microscope.  \nWhat are they lowering into place? A Cover slip  \nB Lens  \nC Slide  \nD Stain  \nYour answer  \n[1]  \n4 Which term describes a cell that contains plasmids but no mitochondria? A Embryonic  \nB Meristem  \nC Prokaryotic  \nD Specialised  \nYour answer  \n[1]  \n© OCR 2022 Turn over  \n4  \n5 The diagram shows the structure of the reflex arc.  \nA  \nD B  \nC  \nWhich label, A, B, C or D, shows the motor neurone?  \nYour answer [1]  \n6 Which combination of hormones is often found in contraceptive pills?  \nA FSH and oestrogen  \nB FSH and progesterone  \nC Oestrogen and progesterone  \nD Oestrogen, progesterone and FSH  \nYour answer [1]  \n7 Which row shows the effects of adrenaline in the body?  \n|  | Breathing rate | ATP production | Blood flow to digestive system |\n| --- | --- | --- | --- |\n| A | increase | increase | increase |\n| B | decrease | decrease | decrease |\n| C | decrease | decrease | increase |\n| D | increase | increase | decrease |\n\nYour answer  \n[1]  \n5  \n8 The hormones controlling the menstrual cycle in cows are the same as in humans. The length of the menstrual cycle is different.  \nThe diagram shows the menstrual cycle of a cow.  \nHormone level  \nProgesterone  \nOestrogen  \n0 2 4 6 8 10 12 Days  \n14 16 18 20 22  \nPredictions for when the cow is most fertile are made based on knowledge of the human menstrual cycle.  \nWhich range of days is when the cow is most fertile?  \nA Days 1–3 B Days 3–6 C Days 9–16 D Days 19–22  \nYour answer  \n[1]  \n© OCR 2022 Turn over  \n6  \n9 The table shows some information about four organisms.  \n\n|  | Surface area\u003Cbr>(m2) | Volume\u003Cbr>(m3) |\n| --- | --- | --- |\n| A | 6 × 10–12 | 1 × 10–18 |\n| B | 6 × 10–8 | 1 × 10–12 |\n| C | 6 × 100 | 1 × 100 |\n| D | 6 × 104 | 1 × 106 |\n\nWhich organism has the smallest surface area compared to their volume?  \nYour answer  [1]  \n10 Photosynthesis is affected by light intensity. The relative light intensity can be calculated using the inverse square law.  \nrelative light intensity =  1   \n(distance from light source)2 ","cbCaifTbabkVwxJB","https://ap.wps.com/l/cbCaifTbabkVwxJB","pdf",2109298,"English","# SECTION A\n## Questions 1-10\n# SECTION B\n## Question 11 (a) Cells in the animal transport system\n## Question 11 (b) Phloem sieve tubes adaptations","[{\"question\":\"What is the total mark value and time limit for this paper?\",\"answer\":\"The total mark is 60, and the time allowed is 1 hour 10 minutes.\"},{\"question\":\"What equipment is required and what can be used?\",\"answer\":\"A ruler (cm/mm) is required. A scientific or graphical calculator and an HB pencil can be used.\"},{\"question\":\"Which topics are assessed in Section A?\",\"answer\":\"Section A covers questions on stem cells and root tip position, preparing cells for a light microscope, reflex arc motor neurones, contraceptive pill hormones, adrenaline effects, cow menstrual-cycle fertility predictions, organism surface-area versus volume, and an inverse square law light intensity calculation.\"}]","Oxford Cambridge and RSA - J250/07 Paper 7 (Higher Tier) - GCSE Combined Science (Biology) | PDF"]