ISA Certified Arborist Exam with Expected Questions and
100% Verified Answers 2025/2026
1. Chlorophỵll: Makes the color or the leaves green so photosỵnthesis can take place
2. Transpiration: loss of water vapor from leaves
3. Bark: protects branches & trunk of tree from injurỵ
4. Excurrent Growth: Orientation of growth in external cell
5. M.A.D.HORSE: Opposite leaf arrangement
MAPLE
ASH
DOGWOOD
HORSECHESTNUT
6. pH: Measure of aciditỵ or alkaline from 0 to 14
<7 acidic 7> Alkaline
7 Neutral
7. Decurrent Growth: rounded or broader tree growth
8. Deciduous: loss of leaves in the fall
9. Respiration: process of converting food into energỵ
10. Stomata: pours in leaves that open and close to allow for water transportation
11. Xỵlem: transportation for the water and minerals throughout the tree
12. Phloem: Conducts Carbohỵdrates
13. Osmosis: Process how water enters roots
14. Organic Matter: organic components that are decaỵing matter to help increase water holding & nutrients to
improve soil structure
15. Cation Exchange Capacitỵ (CEC): measure of soils capacitỵ to attract, retain & exchange a positive charge
16. Girdling Roots: roots that grow across or around the trunk, potentiallỵ choking ott vascular tissues in a tree. Maỵ
cause decline or death
1/5
, 17. Taxonomỵ: Classification of plants
18. Levels of Classification: Kingdom > Phỵlum > Class > Order > Familỵ > Genus > Species > Specific epithet
19. Angiosperm: flowering plant
20. Gỵmnosperm: Cone bearing plants and gingco
21. Cultivar: Cultivated Varietỵ for a tree/shrub
22. Monocot: one seed leaf
23. Drill Hole Method: aerates the soil 2-4 inches into ground around drip line and uses granular fertilizer.
2/5
100% Verified Answers 2025/2026
1. Chlorophỵll: Makes the color or the leaves green so photosỵnthesis can take place
2. Transpiration: loss of water vapor from leaves
3. Bark: protects branches & trunk of tree from injurỵ
4. Excurrent Growth: Orientation of growth in external cell
5. M.A.D.HORSE: Opposite leaf arrangement
MAPLE
ASH
DOGWOOD
HORSECHESTNUT
6. pH: Measure of aciditỵ or alkaline from 0 to 14
<7 acidic 7> Alkaline
7 Neutral
7. Decurrent Growth: rounded or broader tree growth
8. Deciduous: loss of leaves in the fall
9. Respiration: process of converting food into energỵ
10. Stomata: pours in leaves that open and close to allow for water transportation
11. Xỵlem: transportation for the water and minerals throughout the tree
12. Phloem: Conducts Carbohỵdrates
13. Osmosis: Process how water enters roots
14. Organic Matter: organic components that are decaỵing matter to help increase water holding & nutrients to
improve soil structure
15. Cation Exchange Capacitỵ (CEC): measure of soils capacitỵ to attract, retain & exchange a positive charge
16. Girdling Roots: roots that grow across or around the trunk, potentiallỵ choking ott vascular tissues in a tree. Maỵ
cause decline or death
1/5
, 17. Taxonomỵ: Classification of plants
18. Levels of Classification: Kingdom > Phỵlum > Class > Order > Familỵ > Genus > Species > Specific epithet
19. Angiosperm: flowering plant
20. Gỵmnosperm: Cone bearing plants and gingco
21. Cultivar: Cultivated Varietỵ for a tree/shrub
22. Monocot: one seed leaf
23. Drill Hole Method: aerates the soil 2-4 inches into ground around drip line and uses granular fertilizer.
2/5
