ISA Practice Test Questions and All
Quality Answers 2026/2027 Updated.
Branches that are produced after storm - related branch breakage , lion - tail pruning , or
topping? -Answer can be structurally weak until sufficient wood has formed to strengthen their
attachment.
Which of the following is the next layer of wood to form after injury and protects against the
outward spread of decay, according to the CODIT model? -Answer Wall 4
The slightly enlarged portion of a twig where leaves and buds develop is called a -Answer Node
Driving heavy construction equipment across a construction site and creating ruts or scraping
the soil surface, in addition to soil damage from compaction, can cause -Answer the fine,
absorbing roots near the surface to be damaged, crushed, or killed.
Tree stress that occurs suddenly and causes almost immediate damage is known as -Answer
Acute stress
Lateral buds are often dormant because they are inhibited by the terminal bud's -Answer
Apical dominance
The formal pruning system for developing plants to grow in a two-dimensional plane, such as
along a wall or a fence, is known as -Answer espalier
Because sapwood rot decays wood from the outside of the branch inward, -Answer strength
loss is severe.
A subdivision of a species that has a trait distinctly different from the other plants within the
species and naturally breeds true to that trait is called a -Answer Variety
Vascular plants that have "naked seeds" not covered by an ovary are known as -Answer
Gymnosperms
Tree failure risk is often assessed as a combination of the likelihood of failure and impact as well
as the -Answer consequences of failure and impact.
An abnormal condition that impairs the performance of one or more vital plant functions is -
Answer A disorder
, Which of the following is NOT a plant adaptation to help minimize water loss from the foliage? -
Answer broad, thin leaves
The function of the leaf cuticle is to -Answer minimize desiccation (drying out).
Why does removing shoot tips, such as through topping, trigger lateral shoot development? -
Answer The decrease in auxin levels reduces apical dominance.
Which of the following is a true statement about pruning and managing wildlife habitat? -
Answer Arborists should take extra precautions when pruning in sensitive habitats and during
breeding seasons.
Which of the following is a true statement about the management of plant-pathogenic
diseases? -Answer Management of plant diseases often relies greatly on prevention.
Which of the following does NOT significantly impact the forces generated in a rigging
operation? -Answer the type of lowering device used
Research shows that fertilization can increase susceptibility to certain pests likely because -
Answer nitrogen fertilization can trigger allocation of more energy to new growth, rather than
defense.
With more friction at the rigging point, such as when rigging using a natural branch union, the
lead (the part of the line from the rigging point to the piece being cut) experiences? -Answer
more of the force than does the rest of the rope
Some tree species are adapted to minimize water loss in hot, dry conditions with -Answer
large, flat leaf blades.
Which of the following is a true statement about pruning conifers? -Answer Some conifers can
benefit from structural pruning if several upright stems have developed from a damaged
dominant leader.
Which of the following is a potential disadvantage of shearing trees? -Answer reduced
development of interior growth
A potential limitation of using a canopy anchor in stationary rope system climbing is that -
Answer the climbing line must be isolated over and secured at a single branch union in the
canopy.
Quality Answers 2026/2027 Updated.
Branches that are produced after storm - related branch breakage , lion - tail pruning , or
topping? -Answer can be structurally weak until sufficient wood has formed to strengthen their
attachment.
Which of the following is the next layer of wood to form after injury and protects against the
outward spread of decay, according to the CODIT model? -Answer Wall 4
The slightly enlarged portion of a twig where leaves and buds develop is called a -Answer Node
Driving heavy construction equipment across a construction site and creating ruts or scraping
the soil surface, in addition to soil damage from compaction, can cause -Answer the fine,
absorbing roots near the surface to be damaged, crushed, or killed.
Tree stress that occurs suddenly and causes almost immediate damage is known as -Answer
Acute stress
Lateral buds are often dormant because they are inhibited by the terminal bud's -Answer
Apical dominance
The formal pruning system for developing plants to grow in a two-dimensional plane, such as
along a wall or a fence, is known as -Answer espalier
Because sapwood rot decays wood from the outside of the branch inward, -Answer strength
loss is severe.
A subdivision of a species that has a trait distinctly different from the other plants within the
species and naturally breeds true to that trait is called a -Answer Variety
Vascular plants that have "naked seeds" not covered by an ovary are known as -Answer
Gymnosperms
Tree failure risk is often assessed as a combination of the likelihood of failure and impact as well
as the -Answer consequences of failure and impact.
An abnormal condition that impairs the performance of one or more vital plant functions is -
Answer A disorder
, Which of the following is NOT a plant adaptation to help minimize water loss from the foliage? -
Answer broad, thin leaves
The function of the leaf cuticle is to -Answer minimize desiccation (drying out).
Why does removing shoot tips, such as through topping, trigger lateral shoot development? -
Answer The decrease in auxin levels reduces apical dominance.
Which of the following is a true statement about pruning and managing wildlife habitat? -
Answer Arborists should take extra precautions when pruning in sensitive habitats and during
breeding seasons.
Which of the following is a true statement about the management of plant-pathogenic
diseases? -Answer Management of plant diseases often relies greatly on prevention.
Which of the following does NOT significantly impact the forces generated in a rigging
operation? -Answer the type of lowering device used
Research shows that fertilization can increase susceptibility to certain pests likely because -
Answer nitrogen fertilization can trigger allocation of more energy to new growth, rather than
defense.
With more friction at the rigging point, such as when rigging using a natural branch union, the
lead (the part of the line from the rigging point to the piece being cut) experiences? -Answer
more of the force than does the rest of the rope
Some tree species are adapted to minimize water loss in hot, dry conditions with -Answer
large, flat leaf blades.
Which of the following is a true statement about pruning conifers? -Answer Some conifers can
benefit from structural pruning if several upright stems have developed from a damaged
dominant leader.
Which of the following is a potential disadvantage of shearing trees? -Answer reduced
development of interior growth
A potential limitation of using a canopy anchor in stationary rope system climbing is that -
Answer the climbing line must be isolated over and secured at a single branch union in the
canopy.
