2023 Pearson Edexcel GCE Environmental Science In Biology Spec A (8BN0) Paper 02 With Answers (33 Solved Questions)

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MarkScheme (Results)Summer 2023Pearson Edexcel GCEIn Biology Spec A (8BN0) Paper 02Development, Plants and the Environment

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General Marking Guidance•All candidates must receive the same treatment. Examiners must mark the first candidate in exactly the same way asthey mark the last.•Mark schemes should be applied positively. Candidates must be rewarded for what they have shown they can dorather than penalised for omissions.•Examiners should mark according to the mark scheme not according to their perception of where the gradeboundaries may lie.•There is no ceiling on achievement. All marks on the mark scheme should be used appropriately.•All the marks on the mark scheme are designed to be awarded. Examiners should always award full marks if deserved,i.e. if the answer matchesthe mark scheme.Examiners should also be prepared to award zero marks if thecandidate’s response is not worthy of credit according to the mark scheme.•Where some judgement is required, mark schemes will provide the principles by which marks will be awarded andexemplification may be limited.•When examiners are in doubt regarding the application of the mark scheme to a candidate’s response, the teamleader must be consulted.•Crossed out work should be marked UNLESS the candidate has replaced it with analternative response.

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QuestionNumberAnswerMark1(a)The only correct answer is–DGolgi apparatus, mitochondria and rough endoplasmic reticulumAis incorrect becauseanimal cells do not have amyloplasts or chloroplastsBis incorrect becauseanimal cells do not haveamyloplastsCis incorrect becauseanimalcells do not havea cell wall(1)QuestionNumberAnswerMark1(b)The only correct answer is–C the nucleus dividesAis incorrect becausethe cell divides after mitosis is completedBis incorrect becausethe cell membrane does not break down during mitosisDis incorrect becausethe organelles do not multiply during mitosis(1)QuestionNumberAnswerMark1(c)(i)The only correct answer is–AanaphaseB is incorrect because the cell is not in metaphaseC is incorrect because the cell is not in prophaseD is incorrect because the cell is not in telophase(1)

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QuestionNumberAnswerMark1(c)(ii)The only correct answer is–C 7:1A is incorrect because 9:1 is notapproximateto 873:127B is incorrect because 9:2 is notapproximateto 873:127D is incorrect because 7:2 is notapproximateto 873:127(1)QuestionNumberAnswerAdditionalguidanceMark1(c)(iii)A description that makes reference tofour ofthe following:•spindle fibres break down (1)•chromosomes{decondense/ uncoil}(1)•nucleoli form (1)•nuclear{membrane/ envelope }forms (1)•twoseparate{nuclei/ sets of chromosomes }(1)ALLOW nucleolus reformsALLOW sets of chromosomes atopposite sides of the cell(4)

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QuestionNumberAnswerAdditionalguidanceMark2(a)A description that makes reference to the following:•nitrates are used tomake{amino acids/ protein}(1)•{ growth is reduced /plants are stunted }ifnitratesarelacking(1)•(nitrates)needed to make{nucleic acids/ DNA / RNA /ATP / chlorophyll}(1)ALLOW proteins needed for growthALLOWnitrogenous bases(3)QuestionNumberAnswerMark2(b)(i)The only correct answer isD chlorophyllA is incorrect becausethere is no magnesium inamyloseB is incorrect becausethere is no magnesium incalcium pectateD is incorrect becausethere is no magnesium incellulose(1)

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