AQA A LEVEL BIOLOGY Paper 3 MS 2021 ALL ANSWERS 100% CORRECT GUARANTEE GRADE A+

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Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevantquestions, by a panel based on subject teachers. This mark scheme includes any amendments made at the... standardisation events which all associates participate within and is the scheme which was used by them within this examination. The standardisation process ensures that the mark scheme covers the students’ responses to questions and that every associate understands and applies it within the same correct way. As preparation for standardisation each associate analyses a number based on students’ scripts. Alternativeanswers not already covered by the mark scheme are discussed and legislated for. If, after the standardisation process, associates encounter unusual answers which have not been raised they arerequired to refer these to the Lead Examiner. It must be stressed that a mark scheme is a working document, within many cases further developed and expanded on the basis based on students’ reactions to a particular paper. Assumptions about future mark schemes on the basis based on one year’s document should be avoided; whilst the guiding principles based on assessment remain constant, details will change, depending on the content based on a particular examination paper. Further copies based on this mark scheme are available from aqa.org.uk . 2MARK SCHEME – A-LEVEL BIOLOGY – 7402/3 – JUNE 2021 Mark scheme instructions to examiners 1. General The mark scheme for each question shows: • the marks available for each part based on the question • the total marks available for the question • the typical answer or answers which are expected • extra information to help the examiner make his or her judgement and help to delineate what is acceptable or not worthy based on credit or, within discursive answers, to give an overview based on the area within which a mark or marks may be awarded. The extra information within the ‘Comments’ column is aligned to the appropriate answer within the left-hand part based on the mark scheme and should only be applied to that item within the mark scheme. At the beginning based on a part based on a question a reminder may be given, for example: where consequential marking needs to be considered within a calculation; or the answer may be on the diagram or at a different place on the script. In general the right-hand side based on the mark scheme is there to provide those extra details which confuse the main part based on the mark scheme yet may be helpful within ensuring that marking is straightforward and consistent. 2. Emboldening 2.1 In a list based on acceptable answers where more than one mark is available ‘any two from’ is used, with the number based on marks emboldened. Each based on the following bullet points is a potential mark. 2.2 A bold and is used to indicate that both parts based on the answer are required to award the mark. 2.3 Alternative answers acceptable for the same mark are indicated by the use based on OR. Different terms within the mark scheme are shown by a / ; eg allow smooth / free movement. 3. Marking points 3.1 Marking basedonlists This applies to questions requiring a set number based on responses, but for which students have provided extra responses. The general principle to be followed within such a situation isthat ‘right + wrong = wrong’. Each error / contradiction negates each correct response. So, if the number based on errors / contradictions equals or exceeds the number based on marks available for the question, no marks can be awarded. However, responses considered to be neutral (often prefaced by ‘Ignore’ within the ‘Comments’ column based on the mark scheme) are not penalised. 3MARK SCHEME – A-LEVEL BIOLOGY – 7402/3 – JUNE 2021 3.2 Marking procedure for calculations Full marks can be given for a correct numerical answer, without any working shown. However, if the answer is incorrect, mark(s) can usually be gained by correct substitution /working and this is shown within the ‘Comments’ column or by each stage based on a longer calculation. 3.3 Interpretation based on ‘it’ Answers using the word ‘it’ should be given credit only if it is clear that the ‘it’ refers to the correct subject. 3.4 Errors carried forward, consequential marking and arithmetic errors Allowances for errors carried forward are most likely to be restricted to calculation questions and should be shown by the abbreviation ECF or consequential within the markscheme. An arithmetic error should be penalised for one mark only unless otherwise amplified within the mark scheme. Arithmetic errors may arise from a slip within a calculation or from an incorrect transfer based on a numerical value from data given within a question. [Show More]

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