ISA Arborist Certification Practice
Exams Part 1 2024/2025 Exam Questions
and Verified Answers | Already Graded
A+
The ideal soil ratio for solids to pore space is:
(A) 20:80 (B) 35:65 (C) 40:60 (D) 50:50 - 🧠ANSWER ✔✔D
What is the correct scientific name for the oak tree genus?
(A) Quercus (B) Pyrus (C) Larix (D) Acer - 🧠ANSWER ✔✔A
Which of the following is not one of the five major categories of soil
horizons?
(A) O (B) E (C) N (D) B - 🧠ANSWER ✔✔C
Loam is least composed of what soil classification?
(A) Sand(B) Silt(C) Clay(D) Loam is composed of all soils evenly -
🧠ANSWER ✔✔C
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
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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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔A
What best defines the permanent wilting point soil moisture condition?
(A) Water is present in macro and micropores
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
,(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 - 🧠ANSWER ✔✔C
What soil below most likely has the lowest infiltration rate?
(A) Loose sand
(B) Compacted sand
(C) Loose clay
(D) Compacted clay - 🧠ANSWER ✔✔D
What major soil horizon category is not included in the zone designated as
topsoil?
(A) A (B) O (C) E (D) C - 🧠ANSWER ✔✔D
What soil type is most easily compacted?
(A) Sand(B) Clay(C) Silt(D) Bedrock - 🧠ANSWER ✔✔B
What is not a tree characteristic which helps to prevent the loss of water?
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, (A) Increased leaf surface area (B) Deep root systems(C) Leaf hairs(D)
Waxy outer leaf layer - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔D
What is not an advantage of the use of mulching?
(A) Improve infiltration
(B) Promote deep root system
(C) Reduce soil evaporation
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 4
STATEMENT. ALL RIGHTS RESERVED
Exams Part 1 2024/2025 Exam Questions
and Verified Answers | Already Graded
A+
The ideal soil ratio for solids to pore space is:
(A) 20:80 (B) 35:65 (C) 40:60 (D) 50:50 - 🧠ANSWER ✔✔D
What is the correct scientific name for the oak tree genus?
(A) Quercus (B) Pyrus (C) Larix (D) Acer - 🧠ANSWER ✔✔A
Which of the following is not one of the five major categories of soil
horizons?
(A) O (B) E (C) N (D) B - 🧠ANSWER ✔✔C
Loam is least composed of what soil classification?
(A) Sand(B) Silt(C) Clay(D) Loam is composed of all soils evenly -
🧠ANSWER ✔✔C
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔A
What best defines the permanent wilting point soil moisture condition?
(A) Water is present in macro and micropores
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
,(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 - 🧠ANSWER ✔✔C
What soil below most likely has the lowest infiltration rate?
(A) Loose sand
(B) Compacted sand
(C) Loose clay
(D) Compacted clay - 🧠ANSWER ✔✔D
What major soil horizon category is not included in the zone designated as
topsoil?
(A) A (B) O (C) E (D) C - 🧠ANSWER ✔✔D
What soil type is most easily compacted?
(A) Sand(B) Clay(C) Silt(D) Bedrock - 🧠ANSWER ✔✔B
What is not a tree characteristic which helps to prevent the loss of water?
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, (A) Increased leaf surface area (B) Deep root systems(C) Leaf hairs(D)
Waxy outer leaf layer - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔D
What is not an advantage of the use of mulching?
(A) Improve infiltration
(B) Promote deep root system
(C) Reduce soil evaporation
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 4
STATEMENT. ALL RIGHTS RESERVED
