ISA Arborist: Study Guide Practice Exam (100% Correct) Already Passed |Verified| 2025/2026
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Course
Arborist
Institution
Arborist
ISA Arborist: Study Guide Practice Exam
(100% Correct) Already Passed |Verified|
2025/2026
When cutting into or through a tree, what layers would be encountered in order?
Bark, phloem, cambium, xylem.
What happens to lateral buds when the terminal bud is removed during pruning?
Grow...
ISA Arborist: Study Guide Practice Exam
(100% Correct) Already Passed |Verified|
2025/2026
When cutting into or through a tree, what layers would be encountered in order?
Bark, phloem, cambium, xylem.
What happens to lateral buds when the terminal bud is removed during pruning?
Growth may be stimulated in lateral buds.
What information can be inferred from a tree's growth rings?
They indicate the age of the tree, reflect the rate of earlywood and latewood growth, and can
provide insights into past growth conditions.
Which layer is primarily responsible for a tree's outward growth and increased girth?
Cambium.
What best describes mycorrhizae?
A symbiotic relationship between fungi and roots.
How does a Douglas-fir differ from a balsam fir?
They belong to different genera.
What does opposite leaf arrangement refer to?
When two leaves or buds grow at the same node on a twig.
What is the scientific name for Red Oak?
Quercus rubra.
1
, Does the genus Quercus typically exhibit opposite leaf arrangement?
No, this genus usually does not have an opposite leaf arrangement.
What characteristic is unique to pines among conifers?
They have needles in bundles.
Which factor primarily controls the depth, spread, and distribution of tree roots in the soil?
Available oxygen and water.
Where is the most fibrous and absorptive portion of a tree's root system typically found?
In the upper 6 inches of soil.
What happens when a planting hole in clay soil is filled with sandy soil?
Water will drain very slowly out of the planting hole.
How does soil compaction affect pore space?
It reduces total pore space and the percentage of macropores.
What is a typical characteristic of sandy soils in arid regions?
They tend to become alkaline with salt accumulation due to low rainfall.
What irrigation practice is best for trees?
Infrequent, deep soakings are preferable to frequent, shallow waterings.
Which soil type typically has a higher infiltration rate?
Sandy soils.
2
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