Louisiana Arborist Exam / Louisiana Arborist
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Cellulose and lignin are a defense mechanism against predators by what means?
(A) They give off an unfavorable odor
(B) They can't be digested
(C) They have a poor taste
(D) They are toxic –
Correct Answer :Cellulose and lignin prevent herbivores from eating leaves by not being digestible.
The answer is (B
A tree exhibits wounded areas of the lower trunk and some physical damage to surface roots. What
is the most likely cause of the injury?
(A) Frost
(B) Poor soil conditions
(C) Lawnmower or machinery
(D) Disease - Correct Answer :Understanding the location and type of damage is the first step in
identifying the cause of distress. In this case, there is apparent physical damage and it is on the lower
and exposed portion of the tree. This is consistent with machinery such as lawnmowers being used
in contact with the tree and causing harm.
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The answer is (C)
What is not one of the primary functions of the energy produced by photosynthesis?
(A) Maintenance
(B) Growth
(C) Aesthetics
(D) Defense –
Correct Answer :Photosynthesis produces sugars used for energy. This energy is used for:
• Growth • Defense • Storage • Maintenance
The answer is (C)
What statement below is true regarding how a tree's growth rate and photosynthesis rate will react
to the amount of available resources?
(A) The growth rate will be limited before the photosynthesis rate
(B) The photosynthesis rate will be limited before the growth rate
(C) The photosynthesis rate and growth rate become hindered equally with limited resources
(D) The photosynthesis rate will not be hindered by limited resources –
Correct Answer :If water, nutrients, and sunlight are not appropriately available, it will affect the
tree's ability to both produce energy and grow properly. However, the correlation between the
growth rate and the available resources is more sensitive than that of the photosynthesis rate. The
growth rate will begin to drop off significantly before the rate of photosynthesis.
The answer is (A)
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What single resource has the most detrimental effect on a tree's ability to perform photosynthesis if
limited?
(A) Light
(B) Water
(C) CO2
(D) None of the above –
Correct Answer :To perform the process of photosynthesis and produce energy, a tree needs light,
water, chlorophyll, essential minerals, and CO2. If any one of the elements is missing, the process
cannot proceed.
The answer is (D)
What extract listed below is not an allelochemical classified as a natural insecticide?
(A) Nicotine
(B) Lignin
(C) Rotenone
(D) Neem –
Correct Answer :Allelochemicals are deferring agents to ward off insects or herbivores. Some
natural insecticides include nicotine, pyrethrin, neem, and rotenone.
The answer is (B)
A tree is identified as being in the mortality spiral when what has occurred?
(A) The tree has begun to see detrimental stress factors
(B) The tree has seen an isolated but severely detrimental stress factor
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(C) Cumulative stress factors have yielded a situation where very few actions can save the tree
(D) Any combination of stress factors has occurred over time –
Correct Answer :The mortality spiral is a condition where trees have seen a number of stress factors
which now have made the ultimate decline of the tree's health almost inevitable. Once this point has
occurred there is often little or no practices that can reverse the cycle.
The answer is (C)
The foundational element of an appropriate response process (ARP) is which of the following?
(A) Monitoring
(B) Immediate action
(C) Establish thresholds
(D) Readily available resources –
Correct Answer :The appropriate response process (ARP) is the act of gathering information to make
assessments of any action that needs to be taken based on the best interest of the tree and the
client. This cannot be determined without proper and continuous monitoring of the tree's health and
situation.
The answer is (A)
What is not a characteristic of any organism classified as a pest?
(A) Threatens health or appearance of plants
(B) May also contribute to the surrounding landscape
(C) Provides competition to the local landscape
(D) Diminishes safety or enjoyment of an area –
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