ISA Certified Arborist Exam Study
Guide | Arborist Certification
Practice Questions & Exam Prep
2026/2027
, Chlorophyll Makes the color or the leaves green so photosynthesis can take place
Transpiration loss of water vapor from leaves
Bark protects branches & trunk of tree from injury
Excurrent Growth Orientation of growth in external cell
M.A.D.HORSE Opposite leaf arrangement
MAPLE
ASH
DOGWOOD
HORSECHESTNUT
pH Measure of acidity or alkaline from 0 to 14
<7 acidic 7> Alkaline
7 Neutral
Decurrent Growth rounded or broader tree growth
Deciduous loss of leaves in the fall
Respiration process of converting food into energy
Stomata pours in leaves that open and close to allow for water transportation
Xylem transportation for the water and minerals throughout the tree
Phloem Conducts Carbohydrates
Osmosis Process how water enters roots
Organic Matter organic components that are decaying matter to help increase water holding &
nutrients to improve soil structure
Guide | Arborist Certification
Practice Questions & Exam Prep
2026/2027
, Chlorophyll Makes the color or the leaves green so photosynthesis can take place
Transpiration loss of water vapor from leaves
Bark protects branches & trunk of tree from injury
Excurrent Growth Orientation of growth in external cell
M.A.D.HORSE Opposite leaf arrangement
MAPLE
ASH
DOGWOOD
HORSECHESTNUT
pH Measure of acidity or alkaline from 0 to 14
<7 acidic 7> Alkaline
7 Neutral
Decurrent Growth rounded or broader tree growth
Deciduous loss of leaves in the fall
Respiration process of converting food into energy
Stomata pours in leaves that open and close to allow for water transportation
Xylem transportation for the water and minerals throughout the tree
Phloem Conducts Carbohydrates
Osmosis Process how water enters roots
Organic Matter organic components that are decaying matter to help increase water holding &
nutrients to improve soil structure
