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
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
