ISA Certified Arborist Exam Questions
And Answers 2025
Chlorophyll - Answer - Makes the color or the leaves green so photosynthesis can take place
Transpiration - Answer - loss of water vapor from leaves
Bark - Answer - protects branches & trunk of tree from injury
Excurrent Growth - Answer - Orientation of growth in external cell
M.A.D.HORSE - Answer - Opposite leaf arrangement
MAPLE
ASH
DOGWOOD
HORSECHESTNUT
pH - Answer - Measure of acidity or alkaline from 0 to 14
<7 acidic 7> Alkaline
7 Neutral
Decurrent Growth - Answer - rounded or broader tree growth
Deciduous - Answer - loss of leaves in the fall
Respiration - Answer - process of converting food into energy
, Stomata - Answer - pours in leaves that open and close to allow for water transportation
Xylem - Answer - transportation for the water and minerals throughout the tree
Phloem - Answer - Conducts Carbohydrates
Osmosis - Answer - Process how water enters roots
Organic Matter - Answer - organic components that are decaying matter to help increase water holding
& nutrients to improve soil structure
Cation Exchange Capacity (CEC) - Answer - measure of soils capacity to attract, retain & exchange a
positive charge
Girdling Roots - Answer - roots that grow across or around the trunk, potentially choking off vascular
tissues in a tree. May cause decline or death
Taxonomy - Answer - Classification of plants
Levels of Classification - Answer - Kingdom > Phylum > Class > Order > Family > Genus > Species >
Specific epithet
Angiosperm - Answer - flowering plant
Gymnosperm - Answer - Cone bearing plants and gingco
Cultivar - Answer - Cultivated Variety for a tree/shrub
Monocot - Answer - one seed leaf
And Answers 2025
Chlorophyll - Answer - Makes the color or the leaves green so photosynthesis can take place
Transpiration - Answer - loss of water vapor from leaves
Bark - Answer - protects branches & trunk of tree from injury
Excurrent Growth - Answer - Orientation of growth in external cell
M.A.D.HORSE - Answer - Opposite leaf arrangement
MAPLE
ASH
DOGWOOD
HORSECHESTNUT
pH - Answer - Measure of acidity or alkaline from 0 to 14
<7 acidic 7> Alkaline
7 Neutral
Decurrent Growth - Answer - rounded or broader tree growth
Deciduous - Answer - loss of leaves in the fall
Respiration - Answer - process of converting food into energy
, Stomata - Answer - pours in leaves that open and close to allow for water transportation
Xylem - Answer - transportation for the water and minerals throughout the tree
Phloem - Answer - Conducts Carbohydrates
Osmosis - Answer - Process how water enters roots
Organic Matter - Answer - organic components that are decaying matter to help increase water holding
& nutrients to improve soil structure
Cation Exchange Capacity (CEC) - Answer - measure of soils capacity to attract, retain & exchange a
positive charge
Girdling Roots - Answer - roots that grow across or around the trunk, potentially choking off vascular
tissues in a tree. May cause decline or death
Taxonomy - Answer - Classification of plants
Levels of Classification - Answer - Kingdom > Phylum > Class > Order > Family > Genus > Species >
Specific epithet
Angiosperm - Answer - flowering plant
Gymnosperm - Answer - Cone bearing plants and gingco
Cultivar - Answer - Cultivated Variety for a tree/shrub
Monocot - Answer - one seed leaf
