香港CE会考 生物科目 英文版 模拟卷.docx
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香港CE会考 生物科目 英文版 模拟卷.docx
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香港CE会考生物科目英文版模拟卷
ShengKungHuiTangShiuKinSecondarySchool
FirstTermExamination
Biology
Timeallowed:
2hours
F.4December2007
Name:
___________________________
Class:
_____________()
Instructions:
AnswerALLquestions.
SectionA:
StructuredQuestions(90Marks)
SectionB:
MultipleChoice(30Marks)
ThediagramsinthispaperareNOTnecessarilydrawntoscale.
Total:
120Marks
SectionA:
StructuredQuestions(90marks)
1.Thediagrambelowshowshowanamoebakeepsthewaterpotentialofthebodyfluidconstant.Whenwaterisinexcess,acontractilevacuolewouldformwithinitsbodywiththeexpenditureofenergy.(13marks)
Inanexperiment,anAmoebawasplacedindifferentconcentrationsofsaltwater.Thenumberofcontractilevacuolesdischargedinanhourwerecountedandrecordedasshowninthetablebelow:
Concentrationofsaltwater(%)
NumberofcontractilevacuoledischargedperhourperAmoeba
0
0.05
0.10
0.15
0.20
0.25
0.30
100
90
80
70
60
35
20
(a)Plotagraphtoshowtheaboveresult.(3)
(b)Explainwhythedischargeofcontractilevacuoleisnecessaryatallconcentrationsofsaltwatershownabove.(5)
(c)Describeandexplainthechangesinnumberofcontractilevacuolesdischargedfrom0to0.30%concentrationofsaltwater.
(2)
(d)WhatwillhappentoAmoebaifduringtheexperiment,asmallamountofrespiratorypoison(e.g.cyanide)isaddedto0.05%saltwater?
(3)
2.Anexperimentwascarriedouttodemonstrateanaerobicrespirationinyeastasshownbelow:
(12marks)
(a)Whatistheinitialvolumeofthemixtureinthemeasuringcylinders?
(1)
(b)WhatisthevolumeofthemixtureafteronehourincontainersAandBrespectively?
(1)
(c)Whatproductofanaerobicrespirationhascausedtheswellingofthedough?
(1)
(d)Suggestonereasonforthedifferenceinthevolumeofthedoughafteronehour.
(2)
(e)Whichfoodmaterialinthedoughprovidestherawmaterialforanaerobicrespiration?
(1)
(f)Thediagrambelowshowsthetemperaturesoftwosamplesofdoughkeptininsulatedboxesfor2hours.Initially,theywereatthesametemperature.
(i)WhatisthetemperatureshownonthethermometerinXandYrespectively?
(1)
(ii)Suggestonereasonforthedifferenceintemperaturesshownbythetwothermometers.
(2)
(g)(i)Towhichkingdomoforganismsdoesbaker’syeastbelong?
(1)
(ii)Suggestonewaytoslowdowntherisingofthedough.Explainyouranswer.
(2)
3.Twodifferenttypesofcellswereobservedunderamicroscope.Thecellswerethendrawnasshownbelow.(15marks)
(a)NameandstateONEfunctionforeachofthestructureslabeled1,4and6.(6)
(b)(i)Whatstructureappearsinpart9duringcelldivision?
(1)
(ii)GiveTWOfactsaboutthesestructures.
(2)
(c)(i)GiveTWOreasonswhycellAisaplantcell.
(2)
(ii)SuggestONEreasonwhycellAwastakenfromagreenleaf.
(1)
(d)Ascaleisprovidedwitheachdrawing.Usethesescalestofindouttheactualsizesof
(i)thediameterofthestructurelabeled9.
(1)
(ii)thediameterofcellAbetweenpointsXandY(Showyourworkingsteps).
(2)
4.Ateacherhaspreparedakeyforidentifyingseventypesoforganisms:
(7marks)
(a)NamegroupsAtoE.(5)
(b)Thefollowingdiagramshowsanunknowngreenspecimen:
Usingtheabovekey,identifythespecimen.Listthestepsyouusedinfindingoutyouranswer.
(2)
5.Thediagrambelowshowsatransversesectionofpartofagreenleaf.(14marks)
(a)NamepartsA,DandF.(3)
(b)StatethefunctionsofPartAandPartC.
(2)
(c)StateFOURfeaturesshowninthediagramthatfacilitatetheleaftocarryoutphotosynthesis.(4)
(d)Whichformofcarbohydrateis
(i)madebycellDimmediatelyafterphotosynthesis?
(ii)storedinsidecellDafterphotosynthesis?
(iii)transportedawayfromtheleaf?
(3)
(e)Whichstructure,notshowninthediagram,isresponsiblefor
(i)thetransportofwatertocellD?
(ii)thetransportofcarbohydratetootherpartsoftheplant?
(2)
6.Astudenthasperformedaninvestigationtoshowtheneedofsomefactorsforphotosynthesis.Thefollowingdiagramshowshissetup:
(17marks)
Afterexposingtheset-upundersunlightfor3hours,thestudentdetachedtheleafandtesteditforthepresenceofstarch.
(a)Whatshouldbedonetotheplantbeforecarryingouttheexperiment?
Whyisthisstepimportant?
(2)
(b)Whatistheuseofpotassiumhydroxidesolutionintheglassjar?
(1)
(c)Describetheprocedureforthetestofstarch.(4)
(d)Statethecoloursofthefourlabeledregionsaftertheiodinetest.(4)
(e)Whatconclusioncanbedrawnbycomparing
(i)regionsPandQ?
(1)
(ii)regionsQandS?
(1)
(iii)regionsQandR?
(1)
(f)RegionQcanbeusedtoshowtheneedoflightforphotosynthesis.Whichpartoftheleafshouldwechooseasthecontrol?
(1)
7.Inanexperimenttostudytheeffectoftemperatureontheactionofanenzymeforcoagulatingmilk,milkandtheenzymewerefirstkeptinseparatetesttubesinawaterbathatToCfor15minutesbeforetheyweremixed.Theresultingmixturewaskeptinthesamewaterbath.Thetimetakenformilktocoagulatewasnotedandtheexperimentwasrepeatedbyusingwaterbathsatdifferenttemperatures.Thetimetakenforthemilktocoagulateatdifferenttemperaturesisshowninthetablebelow.(9marks)
Temperatureofwaterbath(ToC)
Timetakenforcoagulation(minutes)
10
Nocoagulationoccurred.
20
7
30
4
40
2
50
4
60
Nocoagulationoccurred.
(a)Whatisthepurposeofkeepingthemilkandenzymeinthewaterbathfor15minutesbeforemixing?
(1)
(b)Atwhichtemperaturewastheenzymemostactive?
(1)
(c)Stateandexplainwhethertherewouldbeanychangeintheresultsifthemixtureoriginallykeptat10oCwaswarmedto30oC.(3)
(d)Whatcontrolexperimentshouldbecarriedouttoconfirmthatthecoagulationofmilkwasduetotheactionofanenzyme?
Whatwastheexpectedresult?
(3)
(e)Stateonefactor,otherthantemperature,thatcanaffecttheactivityofenzymes.
(1)
SectionB:
MultipleChoice(30marks)
1.Cellsthathaveahigherlevelofactivityhavemore
A.nucleus.
B.cytoplasm.
C.mitochondria.
D.vacuoles.
2.Whenpreparingatemporaryslideofaspecimenformicroscopicobservation,whatarethepurposesofusingacover-sliptocoverthespecimen?
(1)Toprovideaflatsurfaceforvision.
(2)Toallowmorelighttopassthroughthespecimen.
(3)Toreducethewaterlossfromthespecimen.
A.
(1)and
(2)only
B.
(1)and(3)only
C.
(2)and(3)only
D.
(1),
(2)and(3)
3.Thediagrambelowshowstwoobjectivesofamicroscope.
If150yeastcellscanbeseenunderthelowerpowerobjective,howmanyyeastcellscanbeseenunderthehighpowerobjective?
A.50
B.120
C.150
D.450
4.Whatisanabolism?
A.Itreferstoallthechemicalreactionsthattakeplacewithinanorganism.
B.Itreferstoalltheslowing-downreactionsthattakeplacewithinanorganism.
C.Itreferstoallthebuilding-upreactionsthattakeplacewithinanorganism.
D.Itreferstoallthebreaking-downreactionsthattakeplacewithinanorganism.
5.Whichofthefollowingstatementsaboutamicroscopeiscorrect?
A.Thefirstmicroscopeinventedwasanelectronmicroscope.
B.Acompoundmicroscopeincludestheuseofonelensonly.
C.Alightmicroscopecanonlygivetwo-dimensionalimages.
D.Alightmicroscopeisgenerallymorepowerfulthananelectronmicroscopeintermsofmagnificationpower.
6.Whichofthefollowingistrueaboutactivetransportinourbody?
A.Itisthefastestwayofabsorbingmaterials.
B.Itdoesnotrequireenergy.
C.Itallowsthegreatestamountofmaterialstobeabsorbedwhencomparedwithdiffusionandosmosis.
D.Ithelpstheabsorptionofessentialmaterialsagainstaconcentrationgradient.
7.Whenaplantcellisplacedinahypertonicsolution,whatwillhappeneventually?
A.Thecellwillburst.
B.thecellwillbeplasmolysed.
C.Thecellwillshrink.
D.Thecellwillbecometurgid.
Directions:
Questions8to9refertotheset-upbelow,whichisusedtodemonstrateosmosis.
8.Whichgraphshowsthechangesofliquidlevelintheglasstube?
9.Ifglucoseisusedinsteadofsucrose,theliquidlevelrisesandeventuallyreturnstothefirstliquidlevel.Thisisbecause
A.glucosehasmoreenergythansucrose.
B.glucoseissmallenoughtopassthroughthetubingbutsucroseisnot.
C.glucoseismoresolublethansucrose.
D.glucosecanaffectthewaterpotentialmoresignificantlythansucrose.
10.Therateofdiffusioncanbeincreasedby
(1)increasingthetemperature.
(2)increasingthesurfaceareaoverwhichdiffusionoccurs.
(3)decreasingtheconcentrationgradientbetweenthetworegions.
(4)usingaselectivelypermeablemembrane.
A.
(1)and
(2)only
B.
(1)and(4)only
C.
(2)and(3)only
D.
(1),
(2)and(4)only
Directions:
Questions11–13refertothediagrambelowwhichshowsanapparatustoinvestigatetherespirationofgerminatingseeds.
11.AftertwohoursthecolouredliquidintheU-tuberoseupintherightarm.Whichofthefollowingisthemostsuitablesolutiontobeputintu
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