PLSC Science (LSC01/01) Edexcel International Lower .

Mark Scheme (Results)Summer 2014PLSC Science (LSC01/01)Edexcel International LowerSecondary CurriculumY9 Achievement test

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General Marking Guidance All candidates must receive the same treatment. Examinersmust mark the first candidate in exactly the same way as theymark the last. Mark schemes should be applied positively. Candidates must berewarded for what they have shown they can do rather thanpenalised for omissions. Examiners should mark according to the mark scheme notaccording to their perception of where the grade boundariesmay lie. There is no ceiling on achievement. All marks on the markscheme 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. ifthe answer matches the mark scheme. Examiners should alsobe prepared to award zero marks if the candidate’s response isnot worthy of credit according to the mark scheme. Where some judgement is required, mark schemes will providethe principles by which marks will be awarded andexemplification may be limited. When examiners are in doubt regarding the application of themark scheme to a candidate’s response, the team leader mustbe consulted. Crossed out work should be marked UNLESS the candidate hasreplaced it with an alternative response.LSC01/011406

SECTION AQuestionNumber12345678910AnswerCBBBCBDCBDQuestion Acceptable answers11Mark111111111110Total for questionAdditional guidanceMark1 mark for eachprotectionsupportmovement3Accept: protects (named)organAccept: keeps body upright/keeps body shapeIgnore: structure/keepingbody straight/keeps bodystandingAccept: Muscle attachmentAccept: make blood cellsTotal for question3LSC01/011406

Question Acceptable answersAdditionalguidance12Mark24 correct- 2 marks3 or 2 correct – 1 markTotal forquestionLSC01/0114062

Question Acceptable answersAdditional guidance13Ignore: references tocost/wasteAny 1 of eachAdvantage (1)only water vapour releasedno greenhouse gas(es) producedMarkIgnore: reference topollution if unqualified1Accept: no carbondioxide/CO 2 formed(water) plentiful/will not run outDisadvantage (1)requires lots of energy/to produceproduction releases carbondioxide(CO 2 ) /contributes to climatechange/global warming/greenhousegasAccept: reference toelectricity/fossil fuel usedin production1Ignore: notenvironmentally friendlyhas to be stored under highpressure/in heavy cylindersflammableAccept: (could be)explosive/blow upIgnore:dangerous/hazardous ifunqualifiedIf give more than oneanswer ignore extraanswer(s) unlessincorrectscience/contradictoryTotal for question2LSC01/011406

Question Acceptable answersAdditional guidance14 awater resistanceAccept: drag and friction14 bstreamlined (1)1Reject: air resistanceAccept: “faster” as the firstresponse if not used as thesecond oneTotal for questionfaster rkCDABCABAAC111111111110Total for questionQuestion Acceptable answersAdditional guidance25abasexual (reproduction)Any 2 fromAccept: vegetativeproduces clones /produces(genetically) identical offspring(1)Accept: (plants) have samegenesAccept: offspring same asparentAccept: parent andoffspring are alike/thesame/look the sameAccept: no genetic variationIgnore: replicaneeds only one(parent/plant/organism)2Mark12Accept:no pollination/fertilisation/seeds/ sex cells/gametes(1) neededplants can spread/colonise quickly(1)Accept: quickerTotal for question3LSC01/011406

Question Acceptable answersAdditional guidance26aIf Q, P, S, R award 1 mark2Accept: In any order2R, S, P, Q(2)MarkR least reactive and Q mostreactive (1)bS, P in correct position (1)copper (1)iron sulfate (1)Accept: recognisablespelling of sulfateIgnore any attempt atsymbolsTotal for questionQuestion Acceptable answers27aAdditional guidanceMark2man-made object (1)that orbits (a planet/Earth) (1)b4Any 1 fromcommunication/phones (1)Accept: goes/moves round(a planet/Earth)Ignore: military use orscientific use unlessqualified.1spying/intelligence gathering (1)space / astronomical research (1)weather / meteorology / pollutionmonitoring (1)mapping/navigation (1)TV (1)Total for question3LSC01/011406

DDBDTotal for questionQuestion Acceptable answers38111111111110Additional guidanceMark(increasing light intensity)increases rate of photosynthesis (1)1(at higher light intensity) then rateof photosynthesis stays thesame/constant/does not increaseanymore (1)1Total for questionQuestion Acceptable answers39abAdditional guidanceFfFFFFfffFffff circled (1)2MarkAccept: fF and Ff eitherway round.1Accept: if ff circled butin wrong boxTotal for question1(1)LSC01/0114062

Question Acceptable answersAdditional guidance40abAccept: stays the sameAccept: carbon dioxide/CO 2100 (1)gas (is given off ) (1)Mark11Ignore: any reference toevaporationReject: reference to nongaseous substance(s)Accept: acid spray (givenoff)Total for questionQuestion Acceptable answers41abX where screwdriver touches tinFrom handle of screwdriverdirection (1)position: implication that force (isacting) on the handle (1)c1.0 (1)2Additional guidanceMark12position arrow can beabove or below handledirection must bedownwards between thevertical and theperpendicular (to handle)must be on/very close tothe handle and must belevel or to the left of the“w” in screwdriver14Accept: 1Total for questionLSC01/011406

SECTION BQuestion Acceptable answers42asuitable scale for vertical axis (1)all points correctly plotted (2)Additional guidanceMarkeach small squarerepresents 1 on vertical axisReject points plotted on anon-linear scalebipoint (60,25) circled on graph only(1)-1 for each plotting error(maximum deduction 2marks)ECF from (a) providedlinear scale usedbiirepeat it (1)Ignore: circle it/ignore itcibest fit line drawn through at leastthree points, but not the anomaly(1)ECF line of best fit usingtheir plotted pointsciiCorrect prediction from their bestfit line (1) /- one small square(dependent on use of linear scale)If best fit line has not beenextended to 100 on x-axis,then extrapolate to obtainpredictionTotal for questioncm (1)31112LSC01/0114068

Question Acceptable answers43aAdditional guidanceMark2Any 2 from:wear safety glasses / goggles /facemasks/shield/visor/ lab coat/overalls (1)point test tube away fromself/others(1)Accept: avoid skincontact/ wear glovesIgnore: “safety clothes”unqualifiedwash (splashes off) hands/skin (1)wipe up any acid spills (onbench/floor) (1)bThe larger the surface area, theshorter the time (2)Allow: quicker time/fasterrate2References to “it” should betaken to mean surface areaunless stated otherwiseAllow: converse – thesmaller the surface areathe longer the timec(all three) times will increase / itwill take longer/ it will be slower(1)Allow 1 mark forincomplete or partialanswer with no errors orcontradictions eg thepowder took the shortesttimeIgnore: references tostrength of acidTotal for question15LSC01/011406

Question Acceptable answers44aAdditional guidanceMark1Any 1 from(to make his resultsmore) reliable(1)(to calculate an)average/mean (1)Accept: in case one diesIgnore: references to anomaliesIgnore: reference sultQuestion Acceptable answersAdditional guidanceMarkbBIf more than one answer given 0 marks1cAny 2 fromIgnore: kept in same place2(same amount of)light/lightintensity/sunlight (1)Accept: grown for same timeIgnore: sun alone(same) temperature (1)didii(same amount of)water/moisture/watering(1)fertiliser (1)(number of) peppers (1)11Ignore: any letter givenReject size of peppersReject any other variable other thannumber (of peppers)eAny 1 from(as a) control (1)As a comparison/tocompare the results /number of peppers (1)to see if the fertiliser hadan effect (on the numberof peppers)(1)Reject “pepper plants”1Accept: to see how many peppers areproduced without fertiliserAccept: to see if fertiliser makes adifference to the number of peppers/ tosee the difference on number of pepperswith and without fertiliserIgnore: speed of growth/bettergrowth/size of peppersTotal for questionLSC01/0114067

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PLSC Science (LSC01/01) Edexcel International Lower Secondary Curriculum . Y9 Achievement test . Edexcel and BTEC Qualifications . Edexcel and BTEC qualifications come from Pearson, the world’s leading learning company. We p