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ISA Arborist Certification With 100% Correct Answers
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ISA Arborist Certification With 100%Correct Answers
The ideal soil ratio for solids to pore space is:
(A) 20:80
(B) 35:65
(C) 40:60
(D) 50:50 - correct answer -An even split between the amount of solids and the amount
of pore space is the ideal condition. This allows the pore space to contain sufficient
amounts of water and air while maintaining the soil integrity. The solids ideally are 45%
mineral and 5% organic matter.
The answer is (D)
What is the correct scientific name for the oak tree genus? - correct answer -The genus
is the first part of a tree's scientific name. The oak tree is designated as Quercus.
The answer is (A)
Which of the following is not one of the five major categories of soil horizons?
(A) O
(B) E
(C) N
(D) B - correct answer -The five major categories of soil horizons consist of O, E, A, B,
and C
The answer is (C)
Loam is least composed of what soil classification?
(A) Sand
(B) Silt
(C) Clay
(D) Loam is composed of all soils evenly - correct answer -Loam is a combination of all
three soil types sand, silt, and clay. However, loam without any specific designation is
not equally composed of all three but rather has the least amount of clay.
The answer is (C)
What is the difference in magnitude of acidity between a PH level reading of 4 vs. a PH
reading of 7?
,(A) 1
(B) 3
(C) 100
(D) 1000 - correct answer -The difference in magnitude is exponential between single
PH readings. Therefore, a difference of 1 is equivalent to 101 = 10. For 7 to 4, the
difference is 3 and the magnitude of difference becomes 103 = 1000.
The answer is (D)
What is not a detrimental impact on tree growth from compaction?
(A) Restricted root growth
(B) Reduction of water availability
(C) Increasing organic material
(D) Restricting air movement - correct answer -Compacted soils decrease the total pore
space which will limit the amount of air and water that can be present. Naturally, this
has a detrimental effect on facilitating tree growth by affecting root growth and
absorption. It does not have an impact on the makeup of the soil itself.
The answer is (C)
Field capacity is achieved after the draining of which of the following?
(A) Gravitational water
(B) Capillary water
(C) Micropore water
(D) Compacted drainage - correct answer -Filed capacity is the condition after all of the
water has drained due to gravity.
The answer is (A)
What best defines the permanent wilting point soil moisture condition?
(A) Water is present in macro and micropores
(B) The condition present immediately after the removal of gravitational water
(C) Water is held by soil but unavailable to plants such that they can't recover
(D) No water present in soil - correct answer -Water needs to be available for uptake. If
not, the tree will begin to feel the stress of dehydration and wilting will begin to occur. If
the lack of water persists over a sufficient amount of time, the tree will not be able to
recover and has reached the permanent wilting point.
The answer is (C)
,What soil below most likely has the lowest infiltration rate?
(A) Loose sand
(B) Compacted sand
(C) Loose clay
(D) Compacted clay - correct answer -Infiltration is the ability of water to penetrate the
soil structure. The presence of pores allows the water to more easily flow through. In
general, clay has smaller pores than sand. In addition, compacted soil will further
reduce these openings and make it more difficult for the water to infiltrate.
The answer is (D)
What major soil horizon category is not included in the zone designated as topsoil?
(A) A
(B) O
(C) E
(D) C - correct answer -The horizons O, A, E, and parts of B are considered the topsoil.
The answer is (D)
What soil type is most easily compacted?
(A) Sand
(B) Clay
(C) Silt
(D) Bedrock - correct answer -Since clay has the smallest individual particles, it may be
compressed to minimize the amount of space between the particles more easily than
other soil types.
The answer is (B)
What is not a tree characteristic which helps to prevent the loss of water?
(A) Increased leaf surface area
(B) Deep root systems
(C) Leaf hairs
(D) Waxy outer leaf layer - correct answer -Trees are constantly fighting to ensure
appropriate levels of water and to retain it from excessive transpirational water loss.
Different trees have certain aspects suited to keep sufficient water levels. Deeper roots
have a wider range of water to draw from. Leaves may have outer layers or hairs to
prevent the water from leaving too quickly. A larger surface area is detrimental to a
tree's water retention and some trees will have smaller leaves to help retain the water.
The answer is (A)
, What irrigation system type provides water slowly to specific areas of the tree root
zone?
(A) Drip irrigation
(B) High-pressure injection
(C) Basin irrigation
(D) Soaker hose - correct answer -Drip irrigation applies water in a slower fashion by
emitters spread throughout the root system. This is beneficial in areas of high slopes
where runoff is a problem or when the water is evaporating quickly.
The answer is (A)
Trees help to control stormwater runoff by all of the following means except:
(A) Trees hold water on bark and leaves
(B) Roots intercept and retain runoff
(C) Fallen leaves create a layer of absorption on the ground
(D) All of the above - correct answer -Trees can contribute to runoff control in several
ways including:
• Holding rain on leaves and bark
• Roots retaining soil water
• Fallen leaves create a layer on the ground that prevents it from making it to the ground
The answer is (D)
What is not an advantage of the use of mulching?
(A) Improve infiltration
(B) Promote deep root system
(C) Reduce soil evaporation
(D) Limit weed competition - correct answer -Mulching provides a layer above the soil
that can retain water and help to improve the infiltration as well as reduce evaporation.
The mulch also will prevent weeds from growing in the surrounding area which can steal
water from the tree. It does not have an impact on the structure of the root system.
The answer is (B)
What is the minimum slope for drainage pipes placed above an impervious layer?
(A) 1/16" per ft
(B) 1/8" per ft
(C) 1/4" per ft
(D) 1/2" per ft - correct answer -Drainage pipes should have a slope of at least 1/4" per
linear ft.
The answer is (C)
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