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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 2020 [601/8687/2] DC (CE/SW) 187969/5  \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 answers to each question in the box provided.  \n1 A scientist crossed a white flower with a purple flower.  \nThe white flower is homozygous recessive. The purple flower is heterozygous. The scientist uses this Punnett square to predict the expected ratio of offspring.  \n\n|  | P | p |\n| --- | --- | --- |\n| p | Pp | pp |\n| p | Pp | pp |\n\nWhat is the expected ratio of phenotypes in the offspring? A 1 purple : 1 white  \nB 1 purple : 2 white  \nC 2 purple : 1 white  \nD 4 purple : 0 white  \nYour answer  \n[1]  \n3  \n2 Meiosis is a type of cell division that is needed to make gametes.  \nWhich diagram shows meiosis?  \nn = number of chromosomes  \nA B  \n1n 1n  \n2n 2n  \n1n 1n 2n 2n  \n1n 1n 1n 1n 1n 1n 1n 1n  \nC D  \n2n  \n2n  \n2n  \n2n 2n  \n2n  \n1n 1n  \n3 Which of these is a biotic factor that can affect an ecosystem? A Acidity of soil  \nB Bacterial levels in a river  \nC Carbon dioxide levels in the atmosphere  \nD Oxygen levels in a river  \n1n  \n1n  \n[1]  \n[1]  \n© OCR 2020 Turn over  \n4  \n4  \nnutrients  \nthe  \nfrom  \nLichens are made up of a fungus and algae living together. The fungus gets algae and algae is sheltered by the fungus.  \ndescribes this  \ntype of relationship?  \nWhich term  \nA  \nCompetition  \nMutualism  \nB  \nC  \nParasitism  \nD  \nPredation  \nYour answer  \n[1]  \n5  \noffspring.  \nThe genetic cross shows how genes are  \npassed from parents to  \ntall  \nHh  \nH  \nh  \nHH  \nHh  \ntall  \ntall  \ntall  \nHh  \nH  \nh  \nHh  \nhh  \ntall  \nshort  \nA  \nB  \nC  \nD  \nWhich part of the genetic cross shows the gametes?  \nYour answer  \n[1]  \n6  \nCarbon is recycled in the ecosystem.  \nWhich process helps reduce the level of carbon in the atmosphere?  \nA  \nPhotosynthesis Respiration  \nB  \nC  \nTranslocation  \nD  \nTranspiration  \nYour answer  \n[1]  \n5  \n7 The phenotype of rabbits can be black or white fur. The allele for black fur is dominant. Which genetic cross identifies the genotype of a rabbit with black fur (rabbit X) as Bb? A Cross rabbit X with a black rabbit. All offspring have black fur.  \nB Cross rabbit X with a black rabbit. 50% of offspring have black fur and 50% have white fur. C Cross rabbit X with a white rabbit. All offspring have white fur.  \nD Cross rabbit X with a white rabbit. 50% of offspring have black fur and 50% have white fur.  \nYour answer  \n[1]  \n8 Chalara ash dieback is a fatal disease affecting ash trees. It is caused by a fungus growing on the leaves.  \nWhen the leaves fall to the ground the fungus releases spores spreading the disease.  \nWhich of these would help prevent the spread of Chalara ash dieb","cbCaivVwtAfbqGVR","https://ap.wps.com/l/cbCaivVwtAfbqGVR","pdf",2989213,"English","# SECTION A\n## Questions 1-10\n# SECTION B\n## Questions 11-...","[{\"question\":\"What are the required materials and rules for answering this paper?\",\"answer\":\"A ruler (cm/mm) is required, and a scientific or graphical calculator and an HB pencil can be used. Answers must be written clearly in black ink, using the answer spaces, and question numbers must be clearly shown.\"},{\"question\":\"What topics are covered in Section A?\",\"answer\":\"Section A covers genetics and Punnett squares, identifying meiosis diagrams, biotic factors in ecosystems, symbiotic relationships like lichens, genetic crosses, carbon cycle processes, and preventing the spread of ash dieback.\"},{\"question\":\"How is information presented and assessed in Section B?\",\"answer\":\"Section B uses charts and data to support conclusions, and it assesses answers for correct method where appropriate, with marks shown in brackets and quality of extended response considered for questions marked with an asterisk.\"}]","Oxford Cambridge and RSA GCSE Combined Science (Biology) A Gateway Science Paper 8 - Higher Tier | PDF"]