ISA Arborist Certification: EXAM PREP
Questions and Answers (Complete
Practice Papers)
Compacted soil often lacks which factor necessary for plant
survival? - Correct Answers ✅Sufficient water, oxygen, and
pore space
If a transplanted tree declines or dies within the first year, the
cause is most likely a lack or excess of _______ - Correct
Answers ✅Water
What type of injury occurs when the outer wood and bark of a
tree cool rapidly, causing both to contract and split? -
Correct Answers ✅Frost cracks
A root that arises from a stem, rather than from another root,
is called a(n) _______. - Correct Answers ✅Adventitious root
In an area around a tree that is frequently mowed, an arborist
removed the turf grass and replaced it with mulch. What type
of problem was she trying to prevent? - Correct Answers
✅Physical damage
Leaf or fruit drop is also called _______. - Correct Answers
✅Abscission
What type of plant is more adapted to dry areas? - Correct
Answers ✅Xerophyte
,ISA Arborist Certification: EXAM PREP
Questions and Answers (Complete
Practice Papers)
What is the point at which a plant cannot pull any more water
from the soil and suffers permanent damage? - Correct
Answers ✅Permanent wilting point
Which of the following is a physical injury? - Correct
Answers ✅Lightning damage
Which of the following situations is prone to girdling roots? -
Correct Answers ✅Trees planted too deeply
The process in which a tree uses oxygen to convert
carbohydrates into energy is called _______. - Correct
Answers ✅Aerobic respiration
A prolonged water shortage lasting from days to months
refers to what is called _______. - Correct Answers ✅Chronic
water deficit
What is the most common growth factor that trees or other
plants compete for? - Correct Answers ✅Sunlight
A plant is more likely to experience freezing and chilling
injury if it has not had the chance to become _______. -
Correct Answers ✅Hardened off
,ISA Arborist Certification: EXAM PREP
Questions and Answers (Complete
Practice Papers)
A compound that is poisonous to plants is considered _______.
- Correct Answers ✅Phytotoxic
A tree's natural process of defense by which chemical and
physical boundaries are created to limit the spread of disease
and decay organisms is known as _______. - Correct
Answers ✅Compartmentalization
What is the transition zone from trunk to roots? - Correct
Answers ✅Trunk Flare
A tree has a long, spirally oriented scar down the length of its
trunk that follows the grain of the wood where the bark was
ripped away. What was the likely cause of this injury? -
Correct Answers ✅Lightning Strike
A substance that moves throughout an entire plant is said to
be _______. - Correct Answers ✅systemic
The signs of insect feeding damage are directly related to
________. - Correct Answers ✅The type of mouthparts the
insect has
, ISA Arborist Certification: EXAM PREP
Questions and Answers (Complete
Practice Papers)
Aphids/adelgids, some scales, leafhoppers, and true bugs use
what method of feeding? - Correct Answers ✅Piercing and
sucking
What is honeydew? - Correct Answers ✅a sticky substance
secreted by certain insects when feeding upon plants
Japanese beetles create skeletonized leaves. How are
Japanese beetles classified? - Correct Answers
✅Defoliating insects
Scale insects are sometimes confused with galls. What is a
quick way to distinguish between the two? - Correct
Answers ✅Scrape of the bump and observe the bark below
Insects that carry and transmit disease are known as _______.
- Correct Answers ✅Vectors
Fungicides are usually most effective when used to _______. -
Correct Answers ✅Prevent the etablishment of a disease
Which of the following is a conclusive sign of borer damage? -
Correct Answers ✅Small holes in the trunk and branches
with frass
Questions and Answers (Complete
Practice Papers)
Compacted soil often lacks which factor necessary for plant
survival? - Correct Answers ✅Sufficient water, oxygen, and
pore space
If a transplanted tree declines or dies within the first year, the
cause is most likely a lack or excess of _______ - Correct
Answers ✅Water
What type of injury occurs when the outer wood and bark of a
tree cool rapidly, causing both to contract and split? -
Correct Answers ✅Frost cracks
A root that arises from a stem, rather than from another root,
is called a(n) _______. - Correct Answers ✅Adventitious root
In an area around a tree that is frequently mowed, an arborist
removed the turf grass and replaced it with mulch. What type
of problem was she trying to prevent? - Correct Answers
✅Physical damage
Leaf or fruit drop is also called _______. - Correct Answers
✅Abscission
What type of plant is more adapted to dry areas? - Correct
Answers ✅Xerophyte
,ISA Arborist Certification: EXAM PREP
Questions and Answers (Complete
Practice Papers)
What is the point at which a plant cannot pull any more water
from the soil and suffers permanent damage? - Correct
Answers ✅Permanent wilting point
Which of the following is a physical injury? - Correct
Answers ✅Lightning damage
Which of the following situations is prone to girdling roots? -
Correct Answers ✅Trees planted too deeply
The process in which a tree uses oxygen to convert
carbohydrates into energy is called _______. - Correct
Answers ✅Aerobic respiration
A prolonged water shortage lasting from days to months
refers to what is called _______. - Correct Answers ✅Chronic
water deficit
What is the most common growth factor that trees or other
plants compete for? - Correct Answers ✅Sunlight
A plant is more likely to experience freezing and chilling
injury if it has not had the chance to become _______. -
Correct Answers ✅Hardened off
,ISA Arborist Certification: EXAM PREP
Questions and Answers (Complete
Practice Papers)
A compound that is poisonous to plants is considered _______.
- Correct Answers ✅Phytotoxic
A tree's natural process of defense by which chemical and
physical boundaries are created to limit the spread of disease
and decay organisms is known as _______. - Correct
Answers ✅Compartmentalization
What is the transition zone from trunk to roots? - Correct
Answers ✅Trunk Flare
A tree has a long, spirally oriented scar down the length of its
trunk that follows the grain of the wood where the bark was
ripped away. What was the likely cause of this injury? -
Correct Answers ✅Lightning Strike
A substance that moves throughout an entire plant is said to
be _______. - Correct Answers ✅systemic
The signs of insect feeding damage are directly related to
________. - Correct Answers ✅The type of mouthparts the
insect has
, ISA Arborist Certification: EXAM PREP
Questions and Answers (Complete
Practice Papers)
Aphids/adelgids, some scales, leafhoppers, and true bugs use
what method of feeding? - Correct Answers ✅Piercing and
sucking
What is honeydew? - Correct Answers ✅a sticky substance
secreted by certain insects when feeding upon plants
Japanese beetles create skeletonized leaves. How are
Japanese beetles classified? - Correct Answers
✅Defoliating insects
Scale insects are sometimes confused with galls. What is a
quick way to distinguish between the two? - Correct
Answers ✅Scrape of the bump and observe the bark below
Insects that carry and transmit disease are known as _______.
- Correct Answers ✅Vectors
Fungicides are usually most effective when used to _______. -
Correct Answers ✅Prevent the etablishment of a disease
Which of the following is a conclusive sign of borer damage? -
Correct Answers ✅Small holes in the trunk and branches
with frass
