ISA Arborist Certification Glossary & Terms Question and Answers [100% Correct] 2025/2026
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Course
Arborist
Institution
Arborist
ISA Arborist Certification Glossary & Terms
Question and Answers [100% Correct]
2025/2026
What term refers to the nonliving components of an ecosystem, such as soil, air, and water?
Abiotic
Which plant hormone promotes seed dormancy and causes stomatal closure?
Abscisic acid (ABA)...
ISA Arborist Certification Glossary & Terms
Question and Answers [100% Correct]
2025/2026
What term refers to the nonliving components of an ecosystem, such as soil, air, and water?
Abiotic
Which plant hormone promotes seed dormancy and causes stomatal closure?
Abscisic acid (ABA)
What is the name of the cell structure that allows a leaf to separate from the stem?
Abscission zone
What does the term "acceptable risk" refer to in relation to tree management?
The level of risk a tree owner is willing to accept before considering tree failure
How is acidic soil characterized in terms of pH?
It has a pH less than 7.0
What group of microorganisms has characteristics of both fungi and bacteria and contributes to the
smell of fresh rain?
Actinomycetes
What does the term "action" refer to in the context of carabineers and snap gates?
The number of distinct motions required to open them
What is the term for the point at which pest management actions should be taken?
Action threshold
1
,Which type of crotch is considered stronger and less likely to fail during high winds?
Acute crotches
What does adaptive growth in trees help to achieve?
It helps distribute forces evenly by increasing wood production in areas of structural weakness
What is the boundary on the ground that indicates the spread of a tree's branches?
Drip line
What process describes the adhesion of molecules to the surface of solids or liquids?
Adsorption
What type of assessment provides detailed information about specific tree parts or site conditions?
Advanced assessment
What type of growth arises from dormant or new buds on the main branches or stems in response to
light and moisture?
Adventitious/epicormic growth
What is an adventitious root?
A root that arises from the stem or other parts of the plant in response to moisture and darkness
What process involves providing air to the soil to alleviate compaction?
Aeration
What type of device is used to elevate a worker to the crown of a tree?
Aerial lift device
2
,How is aerial rescue defined?
The method of bringing an injured worker down from a tree
What term describes roots that grow from stems towards the soil and can anchor the tree?
Aerial roots
What type of microorganisms require free, gaseous oxygen for growth?
Aerobic microorganisms
What term refers to a soil cluster made of sand, silt, or clay bonded together by exudates from
microorganisms?
Aggregate
What is agroforestry?
A land-use management system where trees or shrubs are grown alongside crops or pastureland
What is the commonly used trade name for an air tool used to excavate soil within the root zone of
trees?
Air Spade™
What is the name of the highest point in a tree's lightning protection system?
Air terminal
What device uses compressed air to excavate soil and minimize damage to tree roots?
Air tool
How is alkaline soil characterized in terms of pH?
It has a pH greater than 7.0
3
, What are alkaloids?
Substances produced by trees that contain nitrogen and are used for medicinal purposes
What is the term for two parallel rows of trees, typically of the same species, form, and age?
Allée
What does allelopathy refer to in trees?
The production of substances by one tree that negatively affect nearby trees
What is the term for leaves that are arranged alternately at nodes?
Alternate leaves
What enzyme breaks down starch into glucose molecules?
Amylase
What type of microorganisms thrive in environments without free oxygen?
Anaerobic microorganisms
What is an amon-eye nut used for in tree care?
To fasten through-hardware anchor(s) when cabling trees
What is the term for hardware that is used to anchor or terminate cables in trees?
Anchor
What is an anchor-tree used for in tree care?
It provides supplemental support in a guying installation
4
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