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ISA Certified Arborist Chapter 12 Question and answers already passed 2023
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ISA Certified Arborist Chapter 12
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ISA Certified Arborist Chapter 12 (TreeAssessment and Risk Management)
List the three components of risk assessment. - correct answer potential for failure
environment that may contribute to failure
potential target
By definition, if there is no _______, a tree cannot pose a risk. - correct answer target
When performing a tree assessment, it is important to develop and stick to a _______
process. - correct answer systematic
For structural strength, branches should be _______ in diameter than their parent limbs
or trunk. - correct answer smaller
_______ _______ fungi primarily decay the lignin within and between cell walls in the
wood. - correct answer white rot
Codominant stems often have _______ ______ within the branch union, making them
structurally less stable. - correct answer included bark
Trees that have grown in dense shade such as a forest tend to have long, straight
stems with little _______. - correct answer taper
Trees often produce _______ _______, providing more stability to compensate for lean.
- correct answer reaction wood
Brown rot fungi primarily decay the _______, leaving behind the stiff lignin and thereby
reducing the bending strength of the tree. - correct answer cellulose
Decay located in the lower trunk and/or base of the tree is referred to as _______
_______. - correct answer basal rot (butt rot)
In recent years, a number of more advanced _______ _______ _______ have been
developed to help arborists determine the presence and extent of decay inside trees. -
correct answer decay detection devices
True/False - A tree may appear to be solid and structurally sound, and may have a
thick, green canopy, yet can have significant decay inside. - correct answer true
List five indicators of decay in a tree. - correct answer open wounds or cavities
fruiting bodies: mushrooms, conks
cracked or loosened bark
certain insects
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