香港CE会考生物科目英文版模拟卷

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1、ShengKungHuiTangShiuKinSecondarySchoolFirstTermExaminationBiologyTimeallowed:2hoursF.4December2007Name:Class:()Instructions:AnswerALLquestions*SectionA:StructuredQuestions(90Marks)SectionB:MultipleChoice(30Marks)ThediagramsinthispaperareNOTnecessarilydrawntoscale.Total:120MarksSectionA:Structu

2、redQuestions(90marks)1.Thediagrambelowshowshowanamoebakeepsthewaterpotentialofthebodyfluidconstant.Whenwaterisinexcess,acontractilevacuolewouldformwithinitsbodywiththeexpenditureofenergy.(13marks)contentintothesurroundingsInanexperiment,anAmoebawasplacedindifferentconcentrationsofsaltwate匚Then

3、umberofcontractilevacuolesdischargedinanhourwerecountedandrecordedasshowninthetablebelow:Concentrationofsaltwater(%)NumberofcontractilevacuoledischargedperhourperAmoeba01000.05900.10800.15700.20600.25350.3020(a)Plotagraphtoshowtheaboveresult.(3)(b)Explainwhythedischargeofcontractilevacuoleisne

4、cessaryatallconcentrationsofsaltwatershownabove.(c)Describeandexplainthechangesinnumberofcontractilevacuolesdischargedfrom0to0.30%concentrationofsaltwate匚(2)(d)WhatwillhappentoAmoebaifduringtheexperiment,asmallamountofrespiratorypoison(e.g.cyanide)isaddedto0.05%saltwater?ABcm3-100-90B-100_90一8

5、0-701•••■•••、・•・•?.••••••••••裁養:・・曲曲::•cm3(3)2.Anexperimentwascarriedouttodemonstrateanaerobicrespirationinyeastasshownbelow:(12marks)initialonehourlater(a)Whatistheinitialvolumeofthemixtureinthemeasuringcylinders?(1)(b)WhatisthevolumeofthemixtureafteronehourincontainersAandBrespectively?(1)(c

6、)Whatproductofanaerobicrespirationhascausedtheswellingofthedough?(1)(d)Suggestonereasonforthedifferenceinthevolumeofthedoughafteronehour.(2)(e)Whichfoodmaterialinthedoughprovidestherawmaterialforanaerobicrespiration?(1)(f)Thediagrambelowshowsthetemperaturesoftwosamplesofdoughkeptininsulatedbox

7、esfor2hours.Initially,theywereatthesametemperature.100・100•—polythenebags—一insulatedboxes—breadmixXY(i)WhatisthetemperatureshownonthethermometerinXandYrespectively?(1)(ii)Suggestonereasonforthedifferenceintemperaturesshownbythetwothermo