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Qualification Accredited www.ocr.org.uk/biology A LEVEL H420 Exemplar Candidate Work 2 A Level Biology A

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Qualification Accredited www.ocr.org.uk/biology A LEVEL H420 Exemplar Candidate Work 2 A Level Biology A
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  QualificationAccredited www.ocr.org.uk/biology A LEVEL H420 For first teaching in 2015 BIOLOGY A Exemplar Candidate Work  H420/02 Summer 2017 examination series Version 1  Exemplar Candidate Work  2 A Level Biology A © OCR 2017 Contents Introduction 3Question 9 4 Commentary 4Question 15 5 Commentary 5Question 16(a)(i) 6 Commentary 6Question 16(a)(ii) 7 Commentary 8Question 17(b)(i) 9 Commentary 10Question 17(b)(ii) – Exemplar 1 11 Commentary 11Question 17(b)(ii) – Exemplar 2 12 Commentary 12Question 17(b)(ii) – Exemplar 3 13 Commentary 13Question 17(b)(iii) 14 Commentary 14Question 17(c)(i) – Exemplar 1 15 Commentary 15Question 17(c)(i) – Exemplar 2 16 Commentary 16Question 17(c)(i) – Exemplar 3 17 Commentary 17Question 17(c)(ii) 18 Commentary 18Question 18(b)(iii) – Exemplar 1 19 Commentary 19Question 18(b)(iii) – Exemplar 2 19 Commentary 19Question 18(b)(v) – Exemplar 1 21 Commentary 21Question 18(b)(v) – Exemplar 2 22 Commentary 22Question 19(a) 23 Commentary 23Question 19(b)(i) 24 Commentary 25Question 19(b)(ii) 26 Commentary 26Question 19(b)(iii) – Exemplar 1 27 Commentary 27Question 19(b)(iii) – Exemplar 2 28 Commentary 28Question 20(a)(i) 29 Commentary 29Question 20(b)(i) – Exemplar 1 30 Commentary 30Question 20(b)(i) – Exemplar 2 30 Commentary 31Question 20(b)(i) – Exemplar 3 31 Commentary 31Question 20(b)(iii) 32 Commentary 32Question 20(c) – Exemplar 1 33 Commentary 34Question 20(c) – Exemplar 2 34 Commentary 34Question 21(b) 35 Commentary 36Question 21(c) 37 Commentary 37Question 21(d) 38 Commentary 38Question 21(e) 39 Commentary 39  Exemplar Candidate Work  3 A Level Biology A © OCR 2017 Introduction  These exemplar answers have been chosen from the summer 2017 examination series. OCR is open to a wide variety of approaches and all answers are considered on their merits. These exemplars, therefore, should not be seen as the only way to answer questions but do illustrate how the mark scheme has been applied. Please always refer to the specification (http://www.ocr.org.uk/qualifications/as-a-level-gce-biology-a-h020-h420-from-2015/ ) for full details of the assessment for this qualification. These exemplar answers should also be read in conjunction with the sample assessment materials and the June 2017 Examiners’ Report to Centres available on the OCR website http://www.ocr.org.uk/qualifications/ .  The question paper, mark scheme and any resource booklet(s) will be available on the OCR website from summer 2018. Until then, they are available on OCR Interchange (school exams officers will have a login for this). It is important to note that approaches to question setting and marking will remain consistent. At the same time OCR reviews all its qualifications annually and may make small adjustments to improve the performance of its assessments. We will let you know of any substantive changes.  Exemplar Candidate Work  4 A Level Biology A © OCR 2017 Question 9 Cut pieces of agar jelly can be used to investigate the factors affecting diffusion rates in cells.Four pieces of agar jelly containing universal indicator were soaked in the same concentration of hydrochloric acid for one minute. The cubes were then removed and blotted dry.Which of the following pieces of agar jelly would be the first to turn entirely red?A a cube with edges 4   cm eachB a cuboid with edges 2   cm, 4   cm and 6   cmC a cuboid with edges 3   cm, 3   cm and 5   cmD a sphere with diameter 4   cm [1] Mark(s) – 1/1Examiner commentary  The candidate has used the space available on the page to visualise the shapes involved, which may have helped them arrive at the correct answer, i.e. that a shape having one side of 2   cm would mean a distance of only 1   cm from the surface to the centre.  Exemplar Candidate Work  5 A Level Biology A © OCR 2017 Question 15  The image below shows a European badger, Meles meles , which is a member of the family Mustelidae. The American badger belongs to a different genus within the same family.Which of the options, A  to D , is the correct binomial name for the American badger?A Meles leucurus B mellivora capensis C mustelidus Everetti  D Taxidea taxus  [1] Mark(s) – 1/1Examiner commentary Consideration of each response in turn and crossing out of impossible answers is an efficient way to attempt many multiple choice questions. The candidate has dismissed ‘A’ on the grounds that the question states that the American badger is in a different genus and Meles is the same genus. The candidate has also dismissed ‘B’ and ‘C’, presumably on the grounds that a binomial name never begins with a lower case letter. [Please note this image is different from the srcinal question paper, but has been included for illustrative purposes.]
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