ISA Certified Arborist Exam
questions and answers 2024\2025
A+ Grade
Chlorophyll
- correct answer Makes the color or the leaves green so photosynthesis can take place
Transpiration
- correct answer loss of water vapor from leaves
Bark
- correct answer protects branches & trunk of tree from injury
Excurrent Growth
- correct answer Orientation of growth in external cell
M.A.D.HORSE
- correct answer Opposite leaf arrangement
MAPLE
ASH
DOGWOOD
HORSECHESTNUT
pH
- correct answer Measure of acidity or alkaline from 0 to 14
<7 acidic 7> Alkaline
7 Neutral
, Decurrent Growth
- correct answer rounded or broader tree growth
Deciduous
- correct answer loss of leaves in the fall
Respiration
- correct answer process of converting food into energy
Stomata
- correct answer pours in leaves that open and close to allow for water transportation
Xylem
- correct answer transportation for the water and minerals throughout the tree
Phloem
- correct answer Conducts Carbohydrates
Osmosis
- correct answer Process how water enters roots
Organic Matter
- correct answer organic components that are decaying matter to help increase water holding &
nutrients to improve soil structure
Cation Exchange Capacity (CEC)
- correct answer measure of soils capacity to attract, retain & exchange a positive charge
Girdling Roots
- correct answer roots that grow across or around the trunk, potentially choking off vascular tissues in a
tree. May cause decline or death
questions and answers 2024\2025
A+ Grade
Chlorophyll
- correct answer Makes the color or the leaves green so photosynthesis can take place
Transpiration
- correct answer loss of water vapor from leaves
Bark
- correct answer protects branches & trunk of tree from injury
Excurrent Growth
- correct answer Orientation of growth in external cell
M.A.D.HORSE
- correct answer Opposite leaf arrangement
MAPLE
ASH
DOGWOOD
HORSECHESTNUT
pH
- correct answer Measure of acidity or alkaline from 0 to 14
<7 acidic 7> Alkaline
7 Neutral
, Decurrent Growth
- correct answer rounded or broader tree growth
Deciduous
- correct answer loss of leaves in the fall
Respiration
- correct answer process of converting food into energy
Stomata
- correct answer pours in leaves that open and close to allow for water transportation
Xylem
- correct answer transportation for the water and minerals throughout the tree
Phloem
- correct answer Conducts Carbohydrates
Osmosis
- correct answer Process how water enters roots
Organic Matter
- correct answer organic components that are decaying matter to help increase water holding &
nutrients to improve soil structure
Cation Exchange Capacity (CEC)
- correct answer measure of soils capacity to attract, retain & exchange a positive charge
Girdling Roots
- correct answer roots that grow across or around the trunk, potentially choking off vascular tissues in a
tree. May cause decline or death
