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Arborist ISA Review Exam Questions and Answers 100% Solved | Graded A+
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Arborist ISA Review Exam Questions and Answers 100% Solved | Graded A+ abiotic - pertaining to the nonliving parts of an ecosystem, such as soil particles, bedrock, air, water. abscisic acid (ABA) - a plant hormone that stimulates stomatal closure and promotes seed and bud dormancy. abscissio...

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  • October 24, 2024
  • 69
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
Arborist ISA Review Exam Questions

and Answers 100% Solved | Graded A+


abiotic - ✔✔pertaining to the nonliving parts of an ecosystem, such as soil

particles, bedrock, air, water.

abscisic acid (ABA) - ✔✔a plant hormone that stimulates stomatal closure

and promotes seed and bud dormancy.

abscission zone - ✔✔a wall of cells at the base of a petiole, that allows the

leaf to separate from the stem.



- two functions: leaf drop and to protect the region of the stem against

desiccation

acceptable risk - ✔✔the amount of risk that an owner is willing to accept

before tree failure.

acidic soil - ✔✔having a pH less than 7.0, in contrast with alkaline which

has a pH that is higher than 7.0.

,©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
actinomycetes - ✔✔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 threshold - ✔✔the point at which a pest requires the implementation

of a management tactic or control.

acute crotches - ✔✔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 - ✔✔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.

adsorption - ✔✔adhesion on contact of molecules to the surface of solids

or liquids with which they are in contact.

adventitious/epicormic growth - ✔✔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.

adventitious root: - ✔✔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.

,©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
aerial roots: - ✔✔roots that grow from stems toward the soil with the

capacity to become prop roots when they anchor in the soil.

aerobic microorganisms - ✔✔these microbes require free, gaseous oxygen

for growth.

aggregate: - ✔✔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: - ✔✔is a land use management system in

which trees or shrubs are grown around or among crops or pastureland.

ait terrminal - ✔✔the uppermost point of a lightning protection system in a

tree. It is usually made of copper.

alkaline soil - ✔✔having a pH greater than 7.0, in contrast with acidic soil

which has a pH lower than 7.0.

alkaloids - ✔✔substances that are produced by trees and contain nitrogen

and are used by humans for medicines.

allelopathy - ✔✔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.

, ©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
amy;lase - ✔✔an enzyme that can change the starch chains back to

glucose molecules.

anerobic microorganism - ✔✔these microbes live in the absence of free

oxygen.

anon-eye nut - ✔✔drop-forged eye nut is used to fasten through-hardware

anchor(s), used when cabling trees. Advantage is the length of the rod can

be adjusted.

angiosperms - ✔✔hardwood trees that have covered seeds such as oaks

and maples. The seed is born within an ovary.

anions - ✔✔negatively charged atoms or molecules in fertilizer that become

available to the plant in water.

anther - ✔✔the pollen producing part of a flower.

anthocyanin - ✔✔a chemical that gives the red pigments to leaves and

other plant organs.

apical meristem - ✔✔meristems that increase the length of stems and

roots, and produce flowers.

apoplast (apoplasm) - ✔✔the framework of non-living cells and cell walls in

wood and bark. The apoplast stores bound water, which does not flow.

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