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Unit7Exam 1
ScienceUnitTest
Grade:8
Unit7:Biodiversity
1. Theclearingofrainforestsforagriculturalusehasledtoadecreaseinbiodiversityinmanyareas.Onepotentialconsequenceofdeforestationis
a. Anincreaseintheamountofatmosphericoxygen.b. Thelossofplantswithpotentialmedicinaluses.c. Adecreaseinsoilerosion.d. Improvedhabitatforwildlife.
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Unit7Exam 2
2. Apictureofafungusandaclassificationkeyareshownbelow.
Basedonthekey,whichfungusisshown?
a. Turkeytailb. Beefsteakc. Goldenchanterelled. Commonmorel
Unit7Exam 3
3. Twofossilsthatappeartobefromthesametypeoforganismarefoundintwodifferentlayersof
rock.Theylayersofrockareshownbelow.
Whichcanbedeterminedfromthelocationofthefossils?
a. Thepreyoftheorganismsb. Thepredatorsoftheorganismc. Thecauseofdeathforeachorganismd. Therelativeageofeachorganism
Unit7Exam 4
4. AnArcticenvironmenthastemperaturesthatrangebetween−22°Cand6°Cwithsnowcoveringsomeofthearea.Whichadaptationwouldmostlikelyhelpapopulationoforganismssurvivethisenvironment?
a. Longnecksandtalllegsb. Largeshellandleatheryskinc. Lightcoloredfurandlayersofblubberd. Brightlycoloredfeathersandwebbedfeet
5. Thegraphbelowrepresentstheamountofrabbitsinapopulationthathavedifferentrunningspeeds.Anewpredatorisintroducedtotheareathathasarunningspeedrepresentedbythedashedline.
Whichrabbitswillmostlikelyhaveasurvivaladvantageaftertheintroductionofthisnewpredator?
a. Rabbitsthatrunslowerthan10kilometersperhourb. Rabbitsthatrunbetween20and30kilometersperhourc. Rabbitsthatrunbetween30and40kilometersperhourd. Rabbitsthatrunfasterthan40kilometersperhour
Unit7Exam 5
6. Aclassificationkeyforanorganismisshownbelow.
Towhatclassdoestheorganismbelong?
a. Cestodoab. Gastropodac. Trematodad. Bivalvia
7. Astudentobservesatreewithsmallneedle-likeleavesthatstaygreenyearround.Whichconclusion
canthestudentsdrawfromtheshapeoftheleaves?a. Theleavesofthetreedonotperformphotosynthesisb. Theleavesofthetreehaveanillnessthatstuntstheirgrowthc. Theleavesofthetreearenonfunctional.d. Theleavesofthetreeareintroducedtoreducewaterloss.
8. Anuclearpowerplanthasrecentlybeenbuilttogenerateelectricityforatownlocatednearseveralsmalllakes.Whichisnotabenefitofthisnuclearplantbeingbuilt?
a. Thecostoftheelectricitywilldecrease.b. Thelossofhabitatforlocalwildlife.c. Theheatingofhomeswillbeeasier.d. Thenuclearpowerplantwillprovidejobs.
Unit7Exam 6
9. Chipmunksarelittlerodentsthatliveintheforest.Thegraphbelowillustrateshowachipmunkpopulationchangedovertime.
Whichmostlikelyhappenedin2009?
a. Anillnesshitthechipmunkpopulation.b. Therewasanincreasedfoodsourceforthechipmunks.c. Anillnesshitthechipmunk’spredatorpopulation.d. Thechipmunkpopulationevolvedovertime.
Unit7Exam 7
10. Acrosssectionofrocklayersisshownbelow.
Whichfossilisfoundintheoldestlayer?
a. Dinosaurb. Fishc. Shelld. Leaf
11. WhichstatementdescribesapossibleconsequenceifbiodiversityweretodecreaseintheArcticduetotheextinctionofpolarbears?
a. Changesinthefoodweb,leadingtoalossoffoodresourcesfornativepeopleb. Anincreaseinthenumberofproducersafteraherbivorepopulationboomc. Adecreaseinthenumberofherbivoresduetonaturalpredatorsbeinggone.d. Disturbancesinweatherpatterns,leadingtoahigheraveragewatertemperature
Unit7Exam 8
12. Whichadaptationofblackbearsbesthelpsthemsurvivecoldwinters?a. Havingalargehomerangeb. Beingabletohibernatec. Eatingbothplantsandanimalsd. Havingsharpteethandclaws
13. Anorganismandaclassificationkeyareshownbelow
Basedonthekey,whatorganismisshown?
a. Earthwormb. Centipedec. Waterpennyd. Horseshoecrab
Unit7Exam 9
14. Thepicturebelowshowsmalestagbeetlesthathavedifferentmandibletypes.
Malebeetleswithlargemandiblesarebestatguardingburrowswherefemaleshavelaideggs.Maleswhosemandiblesareabsentarebestatdiggingalternateentrancestoaguardedburrowtoreachfemales.Thetablebelowshowsthenumberofmalestagbeetleswithdifferentmandibletypesinonepopulation.
Basedonthisinformation,whichtwomandibletypeswillprobablybecomelesscommoninthispopulationovertime?
a. AbsentandSmallb. AbsentandMediumc. LargeandMediumd. SmallandMedium
Unit7Exam 10
15. Thegraphbelowillustratesthechangeinturtlepopulation.
WhichmostlikelyoccurredbetweenNovemberandFebruary?
a. Therewasadecreaseinthepredatorpopulation.b. Therewasadecreaseinavailablefood.c. Therewasanillnessintheturtlepopulation.d. Therewasanaturaldisaster.
16. Ascientistwasdiggingforfossilsalongarockycliff.Thescientistdiscoveredtrilobitefossilsinrocksattwodifferentdepthsinthecliff.Whatcanbedeterminedaboutthefossilsbasedontheirlocations?
a. Therelativeageofthetrilobitefossilsb. Thedietofthetrilobitesc. Thenumberoftrilobitepredatorsd. Thesizeoftrilobitepopulation
17. Manypeopledependonfoodcaughtintheocean.Whichactionbesthelpspeoplemaintaintheoceansasafoodsource?
a. Addinggardenfertilizerstooceansb. Exploringnewpartsofoceansc. Preventingalossofbiodiversityinoceansd. Buildingmoresportfishingareasnearoceans
Unit7Exam 11
18. Twogeologicalcolumnsareshownbelow.Thecolumnsarefromareasabout1kilometerapart.
Whichlayersweremostlikelydepositedatthesametime?
a. Layers1and4b. Layers2and3c. Layers3and4d. Layers2and6
Unit7Exam 12
19. Afishandadichotomouskeyareshownbelow.
Accordingtothedichotomouskey,whichfishispictured?
a. Smallmouthbassb. Yellowperchc. Gobyd. Lanternfish
Unit7Exam 13
20. Amuskoxisalarge,heavymammal.Ithasshortlegsandiscoveredinlong,thickhair.Amuskoxis
showninthepicturebelow.
Basedonitscharacteristics,inwhichenvironmentisapopulationofmuskoxbestsuitedtolive?
a. Tundrab. Desertc. Wetlandd. Rainforest
21. Whichpopulationwouldbestbeadaptedtomaneuverinarocky,mountainousregion?a. Apopulationoforganismswithhoovesb. Apopulationoforganismswiththickfurc. Apopulationoforganismswithgillsd. APopulationoforganismswithmoistskin
Unit7Exam 14
22. Thegraphbelowillustratesthegrowthofarabbitpopulation.
Whichmostlikelyoccurredbetween1987and1988?
a. Therewasadecreaseintheavailableamountoffood.b. Therewasanincreaseincompetition.c. Therewasadecreaseinthepredatorpopulation.d. Therewasanillnessamongthepopulation.
23. Fertilizerscontainingphosphorousandnitrogenareleachedintoapond.Thenutrientsfromthefertilizercausealgaecoloniesinthepondtogrowrapidly.Aslargequantitiesofalgaedie,thepondwaterbecomesdepletedofoxygen.Whatwillmostlikelyhappentothepondnext?
a. Agreaternumberoforganismswillloveinthepond.b. Therewillbelessbiodiversityinthepond.c. Thewaterwillbecomemoreclear.d. Thedepthofthepondwillincrease.
Unit7Exam 15
24. Thediagrambelowshowsthreesubstratelayerswithfossils.
Whichstatementisbestsupportedbythediagram?
a. ThefossilinLayer1isolderthanthefossilinLayer2.b. ThefossilinLayer3isolderthanthefossilinLayer2.c. ThefossilsinLayers2and3arefromcloselyrelatedorganisms.d. ThefossilsinLayers1and3arefromcloselyrelatedorganisms.
Unit7Exam 16
25. Anorganismliketheoneshowninthepicturebelowiscaughtinanet.
Usingtheclassificationkeyabove,identifytheorganism’sclass.
a. ClassInsectab. ClassReptiliac. ClassMammaliad. ClassChondrichthes
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