ISA Arborist Certification Exam Part 1 questions with
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verified detailed answers || ||
The ideal soil ratio for solids to pore space is:
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(A) 20:80 (B) 35:65 (C) 40:60 (D) 50:50 - ✔✔D
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What is the correct scientific name for the oak tree genus?
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(A) Quercus (B) Pyrus (C) Larix (D) Acer - ✔✔A
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Which of the following is not one of the five major categories of soil horizons?
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(A) O (B) E (C) N (D) B - ✔✔C
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Loam is least composed of what soil classification?
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(A) Sand(B) Silt(C) Clay(D) Loam is composed of all soils evenly - ✔✔C
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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 - ✔✔D
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What is not a detrimental impact on tree growth from compaction?
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(A) Restricted root growth
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(B) Reduction of water availability
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(C) Increasing organic material
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(D) Restricting air movement - ✔✔C
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,Field capacity is achieved after the draining of which of the following?
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(A) Gravitational water
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(B) Capillary water
|| ||
(C) Micropore water
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(D) Compacted drainage - ✔✔A
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What best defines the permanent wilting point soil moisture condition?
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(A) Water is present in macro and micropores
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(B) The condition present immediately after the removal of gravitational water
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(C) Water is held by soil but unavailable to plants such that they can't recover
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(D) No water present in soil - ✔✔C
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What soil below most likely has the lowest infiltration rate?
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(A) Loose sand
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(B) Compacted sand
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(C) Loose clay
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(D) Compacted clay - ✔✔D
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What major soil horizon category is not included in the zone designated as topsoil?
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(A) A (B) O (C) E (D) C - ✔✔D
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What soil type is most easily compacted?
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(A) Sand(B) Clay(C) Silt(D) Bedrock - ✔✔B
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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
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- ✔✔A
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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
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(D) Soaker hose - ✔✔A
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Trees help to control stormwater runoff by all of the following means except:
|| || || || || || || || || || || ||
(A) Trees hold water on bark and leaves
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(B) Roots intercept and retain runoff
|| || || || ||
(C) Fallen leaves create a layer of absorption on the ground
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(D) All of the above - ✔✔D
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What is not an advantage of the use of mulching?
|| || || || || || || || ||
(A) Improve infiltration
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(B) Promote deep root system
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(C) Reduce soil evaporation
|| || || ||
(D) Limit weed competition - ✔✔B
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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 - ✔✔C
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The main function of a rain garden is which of the following?
|| || || || || || || || || || ||
(A) Collect and hold stormwater runoff
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(B) Increase water infiltration
|| || ||
(C) Distribute runoff to dry areas
|| || || || ||
, (D) Facilitate deep root systems - ✔✔A
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What macronutrient most often has the largest requirement for the health of trees?
|| || || || || || || || || || || ||
(A) Iron(B) Sulfur(C) Potassium (D) Nitrogen - ✔✔D
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What essential element is more readily available in an acidic environment than alkaline?
|| || || || || || || || || || || ||
(A) Iron(B) Calcium (C) Sulfur (D) Potassium - ✔✔A
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Required fertilizer distribution rates for quick release are ______________ than for that of
|| || || || || || || || || || || || ||
slow-release.
(A) Greater(B) Less(C) Equal(D) No relationship - ✔✔B
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What project factor listed below has a detrimental effect on the surface application of
|| || || || || || || || || || || || || ||
fertilizer?
(A) Constrained time(B) Inexperienced workers (C) Surface runoff(D) Shallow root
|| || || || || || || || || ||
structure - ✔✔C || ||
What element can be classified as a micronutrient?
|| || || || || || ||
(A) Magnesium (B) Calcium(C) Iron(D) Sulfur - ✔✔C
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What method of fertilizer application may result in the development of thick patches of
|| || || || || || || || || || || || || ||
grass in spots surrounding the tree?
|| || || || ||
(A) Liquid injection(B) Surface application (C) Foliar application (D) Implants - ✔✔A
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What characteristic is used to differentiate between vascular plant classifications?
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(A) Roots (B) Leaves (C) Seeds (D) Skin - ✔✔C
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|| || || || || || || ||
verified detailed answers || ||
The ideal soil ratio for solids to pore space is:
|| || || || || || || || ||
(A) 20:80 (B) 35:65 (C) 40:60 (D) 50:50 - ✔✔D
|| || || || || || || || ||
What is the correct scientific name for the oak tree genus?
|| || || || || || || || || ||
(A) Quercus (B) Pyrus (C) Larix (D) Acer - ✔✔A
|| || || || || || || || ||
Which of the following is not one of the five major categories of soil horizons?
|| || || || || || || || || || || || || ||
(A) O (B) E (C) N (D) B - ✔✔C
|| || || || || || || || ||
Loam is least composed of what soil classification?
|| || || || || || ||
(A) Sand(B) Silt(C) Clay(D) Loam is composed of all soils evenly - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔C
|| || || || || || ||
What soil below most likely has the lowest infiltration rate?
|| || || || || || || || ||
(A) Loose sand
|| ||
(B) Compacted sand
|| || ||
(C) Loose clay
|| ||
(D) Compacted clay - ✔✔D
|| || || ||
What major soil horizon category is not included in the zone designated as topsoil?
|| || || || || || || || || || || || ||
(A) A (B) O (C) E (D) C - ✔✔D
|| || || || || || || || ||
What soil type is most easily compacted?
|| || || || || ||
(A) Sand(B) Clay(C) Silt(D) Bedrock - ✔✔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
|| || || || || || || || || || || || || ||
- ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔C
|| || || || || || || || || || || || || || || || ||
The main function of a rain garden is which of the following?
|| || || || || || || || || || ||
(A) Collect and hold stormwater runoff
|| || || || || ||
(B) Increase water infiltration
|| || ||
(C) Distribute runoff to dry areas
|| || || || ||
, (D) Facilitate deep root systems - ✔✔A
|| || || || || ||
What macronutrient most often has the largest requirement for the health of trees?
|| || || || || || || || || || || ||
(A) Iron(B) Sulfur(C) Potassium (D) Nitrogen - ✔✔D
|| || || || || || ||
What essential element is more readily available in an acidic environment than alkaline?
|| || || || || || || || || || || ||
(A) Iron(B) Calcium (C) Sulfur (D) Potassium - ✔✔A
|| || || || || || || ||
Required fertilizer distribution rates for quick release are ______________ than for that of
|| || || || || || || || || || || || ||
slow-release.
(A) Greater(B) Less(C) Equal(D) No relationship - ✔✔B
|| || || || || || ||
What project factor listed below has a detrimental effect on the surface application of
|| || || || || || || || || || || || || ||
fertilizer?
(A) Constrained time(B) Inexperienced workers (C) Surface runoff(D) Shallow root
|| || || || || || || || || ||
structure - ✔✔C || ||
What element can be classified as a micronutrient?
|| || || || || || ||
(A) Magnesium (B) Calcium(C) Iron(D) Sulfur - ✔✔C
|| || || || || || ||
What method of fertilizer application may result in the development of thick patches of
|| || || || || || || || || || || || || ||
grass in spots surrounding the tree?
|| || || || ||
(A) Liquid injection(B) Surface application (C) Foliar application (D) Implants - ✔✔A
|| || || || || || || || || || ||
What characteristic is used to differentiate between vascular plant classifications?
|| || || || || || || || ||
(A) Roots (B) Leaves (C) Seeds (D) Skin - ✔✔C
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