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ISA Arborist Certification Glossary Solved 2022
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ISA Arborist Certification GlossarySolved 2022
abiotic: - Answer pertaining to the nonliving parts of an ecosystem, such as soil
particles, bedrock, air, water.
abscisic acid (ABA): - Answer a plant hormone that stimulates stomatal closure and
promotes seed and bud dormancy.
abscission zone: - Answer a wall of cells at the base of a petiole, that allows the leaf
to separate from the stem.
acceptable risk: - Answer the amount of risk that an owner is willing to accept before
tree failure.
accessibility: - Answer the establishment of a location used to enter a site.
acidic soil: - Answer having a pH les than 7.0, in contrast with alkaline which has a
pH that is higher than 7.0.
actinomycetes: - Answer microorganisms that have some characteristics of fungi and
bacteria. Soil actinomycetes are very tolerant of water stress and contribute through
their actions to that "good earth" aroma after a rain.
action: - Answer the number of distinct motions for the carabineers and snaps gate
to be opened.
action threshold: - Answer the point at which a pest requires the implementation of a
management tactic or control.
acute crotches: - Answer stronger and wider than a co-dominant crotch, they are not
likely to be a branch that will fail in high winds and are considered desirable.
adaptive growth: - Answer an increase in wood production in localized areas on a
tree, in response to a decrease in wood strength or external loading to maintain an
even distribution of forces across the structure.
drip line - Answer a boundary on the ground delineated by the branch spread of a
single tree or group of trees.
adsorption: - Answer adhesion on contact of molecules to the surface of solids or
liquids with which they are in contact.
advanced assessment: - Answer an assessment performed to provide detailed
information about specific tree parts, defects or site conditions.
adventitious/epicormic growth: - Answer new growth arising directly from dormant or
new buds on main branches, stems, or trunks often in response to moisture and light
that has no connection to apical meristems.
,ISA Arborist Certification Glossary
Solved 2022
adventitious root: - Answer a root arising from parts of the root or the stem, often in
response to moisture and darkness that has no connection to apical meristems.
aeration: - Answer the provision of air to the soil to alleviate soil compaction.
aerial lift device: - Answer a truck with booms and a bucket, for elevating a worker to
a tree's crown; may also be mounted on a self-propelled machine known as a mini-
lift.
aerial rescue: - Answer a method of bringing an injured worker down from a tree.
aerial roots: - Answer roots that grow from stems toward the soil with the capacity to
become prop roots when they anchor in the soil.
aerobic microorganisms: - Answer these microbes require free, gaseous oxygen for
growth.
aggregate: - Answer soil such as sand, silt, or clay, a cluster of soil particles and
organic matter, bonded together by exudates from microorganisms. It is often used
under paved surfaces, as backfill.
agroforestry or agro-sylviculture: - Answer is a land use management system in
which trees or shrubs are grown around or among crops or pastureland.
Air Spade™: - Answer the commonly used trade name for an air tool.
air terminal: - Answer the uppermost point of a lightning protection system in a tree.
It is usually made of copper.
air tool: - Answer also called air excavation device, a device that uses a jet of
compressed air to excavate soil within the root zone of trees and minimize damage
to tree roots.
alkaline soil: - Answer having a pH greater than 7.0, in contrast with acidic soil which
has a pH lower than 7.0.
alkaloids: - Answer substances that are produced by trees and contain nitrogen and
are used by humans for medicines.
allée: - Answer two parallel rows of trees, usually of the same species, form, and
age, often having canopies that have grown together.
allelopathy: - Answer the production of substances by one tree that adversely affect
other trees nearby. Root exudates from some trees can kill or stall growth of many
soil organisms.
alternate leaves: - Answer occur when there is one bud or leaf at a node.
,ISA Arborist Certification Glossary
Solved 2022
amylase: - Answer an enzyme that can change the starch chains back to glucose
molecules.
anaerobic microorganisms: - Answer these microbes live in the absence of free
oxygen.
amon-eye nut: - Answer drop-forged eye nut is used to fasten through-hardware
anchor(s), used when cabling trees.
anchor: - Answer the hardware installed to affix and/or terminate a cable or guy to
the tree, ground, or other device.
anchor-tree: - Answer a tree used to provide supplemental support in a guying
installation.
angiosperms: - Answer hardwood trees that have covered seeds such as oaks and
maples. The seed is born within an ovary.
anions: - Answer negatively charged atoms or molecules in fertilizer that become
available to the plant in water.
ANSI: - Answer the American National Standards Institute.
ANSI A300: - Answer the performance parameters established by industry
consensus as a rule for the measure of extent, quality, quantity, value, or weight
used to write specifications.
ANSI Z60.1: - Answer the American Standard for Nursery Stock, 2014 edition.
ANSI Z133: - Answer the Safety Standard that provides the most current criteria in
the United States for arborists and other workers engaged in arboricultural
operations.
anther: - Answer the pollen producing part of a flower.
anthocyanin: - Answer a chemical that gives the red pigments to leaves and other
plant organs.
antitranspirant: - Answer a substance applied to the foliage of plants to reduce water
loss.
anvil-type pruning tool: - Answer a pruning tool that has a sharp straight blade that
cuts against a flat non-cutting surface.
apical dominance: - Answer the inhibition of growth of lateral buds by the terminal or
apical bud.
, ISA Arborist Certification Glossary
Solved 2022
apical meristem: - Answer meristems increase the length of stems and roots, and
produce flowers.
apoplast: - Answer the framework of non-living cells and cell walls in wood and bark.
The apoplast stores bound water, which does not flow.
appraisal: - Answer placing a monetary value on a tree.
approach distances: - Answer the minimum distances between energized conductors
and personnel.
arboriculture: - Answer the art, science, technology, and business of commercial,
public, and utility tree care. Arboriculture focus is on the tree while the focus of
forestry is on all trees.
arborist: - Answer an individual engaged in the profession of arboriculture who,
through experience, education, and training, possesses the competence to perform
the management of trees and other woody plants.
arborist trainee: - Answer an individual undergoing on-the-job training to obtain the
experience required to manage trees and woody plants. Such trainees shall be
under the supervision of an arborist.
arbuscular mycorrhizae: - Answer commonly called endomycorrhizae infects the
internal tree root cells and are most common in deciduous forests.
armillaria root disease: - Answer cause death to trees under all types of stress by
reducing absorption and translocation of water and minerals from the soil to the tree.
arthropods: - Answer microscopic insects and mites that are vital in processing soil
organic matter and mineralizing detritus.
ascender: - Answer attached to the rope, this piece of equipment will grip in one
direction (down) and slide in the other (up) allowing the climber to ascend up the
rope in contrast with descender.
auger: - Answer a tool that bores holes in wood.
auxin: - Answer a tree growth regulator that controls cell elongation.
axial parenchyma: - Answer cells that run in a vertical direction on the trunk.
axil: - Answer the point of attachment of a leaf petiole to a stem.
back cut: - Answer a cut made on a tree trunk or branch, opposite from the notch,
face cut, or undercut.
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