ISA Arborist Certification Practice Exams
Part 1 QUESTIONS & ANSWERS BEST
EXAM SOLUTION LATEST UPDATE
2025/2026 RATED A+
The ideal soil ratio for solids to pore space is:
(A) 20:80 (B) 35:65 (C) 40:60 (D) 50:50 - CORRECT ANSWERS D
What is the correct scientific name for the oak tree genus?
(A) Quercus (B) Pyrus (C) Larix (D) Acer - CORRECT ANSWERS 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 ANSWERS C
Loam is least composed of what soil classification?
(A) Sand(B) Silt(C) Clay(D) Loam is composed of all soils evenly - CORRECT ANSWERS 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 ANSWERS 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 ANSWERS 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 ANSWERS 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 ANSWERS C
What soil below most likely has the lowest infiltration rate?
(A) Loose sand
(B) Compacted sand
(C) Loose clay
(D) Compacted clay - CORRECT ANSWERS D
What major soil horizon category is not included in the zone designated as topsoil?
(A) A (B) O (C) E (D) C - CORRECT ANSWERS D
What soil type is most easily compacted?
(A) Sand(B) Clay(C) Silt(D) Bedrock - CORRECT ANSWERS 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
ANSWERS 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 ANSWERS 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 ANSWERS 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 ANSWERS 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 ANSWERS 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 - CORRECT ANSWERS A
What macronutrient most often has the largest requirement for the health of trees?
(A) Iron(B) Sulfur(C) Potassium (D) Nitrogen - CORRECT ANSWERS D
What essential element is more readily available in an acidic environment than alkaline?
(A) Iron(B) Calcium (C) Sulfur (D) Potassium - CORRECT ANSWERS A
Required fertilizer distribution rates for quick release are ______________ than for that of slow-release.
(A) Greater(B) Less(C) Equal(D) No relationship - CORRECT ANSWERS 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 - CORRECT
ANSWERS C
What element can be classified as a micronutrient?
(A) Magnesium (B) Calcium(C) Iron(D) Sulfur - CORRECT ANSWERS 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 - CORRECT ANSWERS
A
What characteristic is used to differentiate between vascular plant classifications?
(A) Roots (B) Leaves (C) Seeds (D) Skin - CORRECT ANSWERS C
Part 1 QUESTIONS & ANSWERS BEST
EXAM SOLUTION LATEST UPDATE
2025/2026 RATED A+
The ideal soil ratio for solids to pore space is:
(A) 20:80 (B) 35:65 (C) 40:60 (D) 50:50 - CORRECT ANSWERS D
What is the correct scientific name for the oak tree genus?
(A) Quercus (B) Pyrus (C) Larix (D) Acer - CORRECT ANSWERS 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 ANSWERS C
Loam is least composed of what soil classification?
(A) Sand(B) Silt(C) Clay(D) Loam is composed of all soils evenly - CORRECT ANSWERS 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 ANSWERS 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 ANSWERS 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 ANSWERS 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 ANSWERS C
What soil below most likely has the lowest infiltration rate?
(A) Loose sand
(B) Compacted sand
(C) Loose clay
(D) Compacted clay - CORRECT ANSWERS D
What major soil horizon category is not included in the zone designated as topsoil?
(A) A (B) O (C) E (D) C - CORRECT ANSWERS D
What soil type is most easily compacted?
(A) Sand(B) Clay(C) Silt(D) Bedrock - CORRECT ANSWERS 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
ANSWERS 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 ANSWERS 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 ANSWERS 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 ANSWERS 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 ANSWERS 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 - CORRECT ANSWERS A
What macronutrient most often has the largest requirement for the health of trees?
(A) Iron(B) Sulfur(C) Potassium (D) Nitrogen - CORRECT ANSWERS D
What essential element is more readily available in an acidic environment than alkaline?
(A) Iron(B) Calcium (C) Sulfur (D) Potassium - CORRECT ANSWERS A
Required fertilizer distribution rates for quick release are ______________ than for that of slow-release.
(A) Greater(B) Less(C) Equal(D) No relationship - CORRECT ANSWERS 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 - CORRECT
ANSWERS C
What element can be classified as a micronutrient?
(A) Magnesium (B) Calcium(C) Iron(D) Sulfur - CORRECT ANSWERS 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 - CORRECT ANSWERS
A
What characteristic is used to differentiate between vascular plant classifications?
(A) Roots (B) Leaves (C) Seeds (D) Skin - CORRECT ANSWERS C
