ISA Arborist Certification Practice Exams Part 1 Questions and Answers UApdated 2026

ISA Arborist Certification Practice
Exams Part 1 Questions and
Answers UApdated 2026
TheMidealMsoilMratioMforMsolidsMtoMporeMspaceMis:

(A)M20:80M(B)M35:65M(C)M40:60M(D)M50:50M-MAnswerMD



WhatMisMtheMcorrectMscientificMnameMforMtheMoakMtreeMgenus?

(A)MQuercusM(B)MPyrusM(C)MLarixM(D)MAcerM-MAnswerMA



WhichMofMtheMfollowingMisMnotMoneMofMtheMfiveMmajorMcategoriesMofMsoilMhorizons?

(A)MOM(B)MEM(C)MNM(D)MBM-MAnswerMC



LoamMisMleastMcomposedMofMwhatMsoilMclassification?

(A)MSand(B)MSilt(C)MClay(D)MLoamMisMcomposedMofMallMsoilsMevenlyM-MAnswerMC



WhatMisMtheMdifferenceMinMmagnitudeMofMacidityMbetweenMaMPHMlevelMreadingMofM4
Mvs.MaMPHMreadingMofM7?

(A)M1(B)M3(C)M100M(D)M1000M-MAnswerMD



WhatMisMnotMaMdetrimentalMimpactMonMtreeMgrowthMfromMcompaction?

(A)MRestrictedMrootMgrowth

(B)MReductionMofMwaterMavailabilityM

(C)MIncreasingMorganicMmaterialM

(D)MRestrictingMairMmovementM-MAnswerMC



FieldMcapacityMisMachievedMafterMtheMdrainingMofMwhichMofMtheMfollowing?

(A)MGravitationalMwaterM

(B)MCapillaryMwater

(C)MMicroporeMwater

(D)MCompactedMdrainageM-MAnswerMA

,WhatMbestMdefinesMtheMpermanentMwiltingMpointMsoilMmoistureMcondition?

(A)MWaterMisMpresentMinMmacroMandMmicropores

(B)MTheMconditionMpresentMimmediatelyMafterMtheMremovalMofMgravitationalMwaterM

(C)MWaterMisMheldMbyMsoilMbutMunavailableMtoMplantsMsuchMthatMtheyMcan'tMrecover
M

(D)MNoMwaterMpresentMinMsoilM-MAnswerMC



WhatMsoilMbelowMmostMlikelyMhasMtheMlowestMinfiltrationMrate?

(A)MLooseMsand

(B)MCompactedMsandM

(C)MLooseMclay

(D)MCompactedMclayM-MAnswerMD



WhatMmajorMsoilMhorizonMcategoryMisMnotMincludedMinMtheMzoneMdesignatedMasMtopso
il?

(A)MAM(B)MOM(C)MEM(D)MCM-MAnswerMD



WhatMsoilMtypeMisMmostMeasilyMcompacted?

(A)MSand(B)MClay(C)MSilt(D)MBedrockM-MAnswerMB



WhatMisMnotMaMtreeMcharacteristicMwhichMhelpsMtoMpreventMtheMlossMofMwater?

(A)MIncreasedMleafMsurfaceMareaM(B)MDeepMrootMsystems(C)MLeafMhairs(D)MWaxyMouter
MleafMlayerM-MAnswerMA



WhatMirrigationMsystemMtypeMprovidesMwaterMslowlyMtoMspecificMareasMofMtheMtreeMro
otMzone?

(A)MDripMirrigation(B)MHigh-pressureMinjectionM(C)MBasinMirrigation

(D)MSoakerMhoseM-MAnswerMA



TreesMhelpMtoMcontrolMstormwaterMrunoffMbyMallMofMtheMfollowingMmeansMexcept:

(A)MTreesMholdMwaterMonMbarkMandMleaves

(B)MRootsMinterceptMandMretainMrunoff

,(C)MFallenMleavesMcreateMaMlayerMofMabsorptionMonMtheMgroundM

(D)MAllMofMtheMaboveM-MAnswerMD



WhatMisMnotManMadvantageMofMtheMuseMofMmulching?

(A)MImproveMinfiltration

(B)MPromoteMdeepMrootMsystemM

(C)MReduceMsoilMevaporationM

(D)MLimitMweedMcompetitionM-MAnswerMB



WhatMisMtheMminimumMslopeMforMdrainageMpipesMplacedMaboveManMimperviousMlayer?

(A)M1/16"MperMftM(B)M1/8"MperMftM(C)M1/4"MperMftM(D)M1/2"MperMftM-MAnswerMC



TheMmainMfunctionMofMaMrainMgardenMisMwhichMofMtheMfollowing?

(A)MCollectMandMholdMstormwaterMrunoffM

(B)MIncreaseMwaterMinfiltration

(C)MDistributeMrunoffMtoMdryMareas

(D)MFacilitateMdeepMrootMsystemsM-MAnswerMA



WhatMmacronutrientMmostMoftenMhasMtheMlargestMrequirementMforMtheMhealthMofMtree
s?

(A)MIron(B)MSulfur(C)MPotassiumM(D)MNitrogenM-MAnswerMD



WhatMessentialMelementMisMmoreMreadilyMavailableMinManMacidicMenvironmentMthanMalk
aline?

(A)MIron(B)MCalciumM(C)MSulfurM(D)MPotassiumM-MAnswerMA



RequiredMfertilizerMdistributionMratesMforMquickMreleaseMareM______________MthanMforM
thatMofMslow-release.

(A)MGreater(B)MLess(C)MEqual(D)MNoMrelationshipM-MAnswerMB



WhatMprojectMfactorMlistedMbelowMhasMaMdetrimentalMeffectMonMtheMsurfaceMapplicatio
nMofMfertilizer?

, (A)MConstrainedMtime(B)MInexperiencedMworkersM(C)MSurfaceMrunoff(D)MShallowMrootMstr
uctureM-MAnswerMC



WhatMelementMcanMbeMclassifiedMasMaMmicronutrient?

(A)MMagnesiumM(B)MCalcium(C)MIron(D)MSulfurM-MAnswerMC



WhatMmethodMofMfertilizerMapplicationMmayMresultMinMtheMdevelopmentMofMthickMpatc
hesMofMgrassMinMspotsMsurroundingMtheMtree?

(A)MLiquidMinjection(B)MSurfaceMapplicationM(C)MFoliarMapplicationM(D)MImplantsM-
MAnswerMA



WhatMcharacteristicMisMusedMtoMdifferentiateMbetweenMvascularMplantMclassifications?

(A)MRootsM(B)MLeavesM(C)MSeedsM(D)MSkinM-MAnswerMC



OfMtheMoptionsMlistedMbelowMwhichMhasMtheMbroadestMlevelMofMtaxonomicMhierarchy?

(A)MGenusM(B)MOrderM(C)MClassM(D)MFamilyM-MAnswerMC



WhatMcharacteristicMbelowMisMusedMtoMdifferentiateMbetweenMaMsimpleMleafMandMaMc
ompoundMleaf?

(A)MNumberMofMbudsM(B)MLengthMofMpetioleM(C)MShapeMofMleafletM(D)MNumberMofMle
afletsM-MAnswerMD



WhatMmajorMgroupMofMconifersMisMdefinedMbyMneedlesMborneMinMclusters?

(A)MPineM(B)MSpruceM(C)MFir(D)MJuniperM-MAnswerMA



WhatMleafMmarginMtypeMisMcharacterizedMbyMhavingMaMsmoothMedge?

(A)MEntireM(B)MSerrateM(C)MSerrulateM(D)MDentateM-MAnswerMA



WhatMcharacteristicMbelowMisMassociatedMwithMdicotsMratherMthanMmonocots?

(A)MParallelMleafMveins(B)MFloralMpartsMusuallyMinMmultiplesMofMfourMorMfiveM(C)MFibro
usMrootMsystem(D)MOneMcotyledonM-MAnswerMB