act科学 题目3

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1、PassageIIIAstudentperformed2studiestoinvestigatethefactorsthataffectthegerminationofpeonyseeds.Study1Peonyseedswereplacedindrycontainers.Someofthecontainerswerestoredat5°Cforeither4,6,8,or10 weeks.Thetemperatureandtimeperiodsweredefinedasthe storagetemperature

2、andthe storageperiod,respectively.Thepeonyseedsweredividedevenlysothattherewere20 setsof25 seeds.Twentypetridisheswerethenprepared.Eachcontaineddamppaper.Eachsetofseedswasplacedinaseparatepetridish.Eachpetridishwasmaintainedat1of4 temperaturesfor30 days.Thetem

3、peratureandtimeperiodsweredefinedasthe germinationtemperature andthe germinationperiod,respectively.Table 1showsthenumberofseedsthatgerminatedineachdish.Storageperiod(weeks)Numberofpeonyseedsthatgerminatedwhenmaintainedatagerminationtemperatureof:13°C18°C23°C2

4、8°C 0 4 6 810 0 0 3 715 0 2 82224 0 0 6182100001Table1Study2Peonyseedswereplacedindrycontainers.Thecontainerswerestoredatvarioustemperaturesfor10 weeks.Thepeonyseedsweredividedevenlysothattherewere20 setsof25 seeds.Twentypetridisheswerethenprepared.Eachcontain

5、eddamppaper.Eachsetofseedswasplacedinapetridish.Thepetridishesweremaintainedat1of4 temperaturesfor30 days.Table 2showsthenumberofseedsthatgerminatedineachdish.Storagetemperature(°C)Numberofpeonyseedsthatgerminatedwhenmaintainedatagerminationtemperatureof:13°C1

6、8°C23°C28°C 0 51015201516 0 0 024236 0 02121 4 0 011000Table2TablesadaptedfromJoelBeller, ExperimentingwithPlants.©1985byJoelBeller.1.Ingeneral,theresultsofStudy1suggestthatpeonyseedsthatareplacedinapetridishcontainingdamppaperaremostlikelytogerminatewhentheya

7、remaintainedatwhichofthefollowingtemperatures?1.A. 13°C2.B. 18°C3.C. 23°C4.D. 28°C2.Supposeanothersetof25 peonyseedshadbeenincludedinStudy 2andtheseseedshadastoragetemperatureof25°Candagerminationtemperatureof18°C.Basedontheinformationprovided,thenumberofseeds

8、thatwouldhavegerminatedafterbeingmaintainedfor30 dayswouldmostlikelyhavebeenclosestto:1.F.  0.2.G.  8.3.H. 16.4.J. 24.3.InStudy2,atthestoragetemperatureof5°C,asgerminationtemperatu