香港CE会考 生物科目 英文版 模拟卷.docx

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