ISA Certified Arborist Practice
Exam Study Guide | Arborist
Certification Questions & Exam
Prep
2026/2027
, The ideal soil ratio for solids to pore space is: 50:50
3 multiple choice options
What is the correct scientific name for the oak tree genus? Quercus
3 multiple choice options
Which of the following is not one of the five major N
categories of soil horizons? 3 multiple choice options
Loam is least composed of what soil classification? Clay
3 multiple choice options
What is the difference in magnitude of acidity between a 1000
PH level reading of 4 vs. a PH reading of 7? 3 multiple choice options
What is not a detrimental impact on tree growth from Increasing organic material
compaction? 3 multiple choice options
Field capacity is achieved after the draining of which of the Gravitational water
following? 1 multiple choice option
What best defines the permanent wilting point soil moisture Water is held by soil but unavailable to plants such that they can't recover
condition? 3 multiple choice options
What soil below most likely has the lowest infiltration rate? Compacted clay
3 multiple choice options
What major soil horizon category is not included in the C
zone designated as topsoil? 3 multiple choice options
What soil type is most easily compacted? Clay
3 multiple choice options
What is not a tree characteristic which helps to prevent the Increased leaf surface area
loss of water? 3 multiple choice options
What irrigation system type provides water slowly to Drip irrigation
specific areas of the tree root zone? 3 multiple choice options
Trees help to control stormwater runoff by all of the All of the above
following means except: 3 multiple choice options
What is not an advantage of the use of mulching? Promote deep root system
3 multiple choice options
Exam Study Guide | Arborist
Certification Questions & Exam
Prep
2026/2027
, The ideal soil ratio for solids to pore space is: 50:50
3 multiple choice options
What is the correct scientific name for the oak tree genus? Quercus
3 multiple choice options
Which of the following is not one of the five major N
categories of soil horizons? 3 multiple choice options
Loam is least composed of what soil classification? Clay
3 multiple choice options
What is the difference in magnitude of acidity between a 1000
PH level reading of 4 vs. a PH reading of 7? 3 multiple choice options
What is not a detrimental impact on tree growth from Increasing organic material
compaction? 3 multiple choice options
Field capacity is achieved after the draining of which of the Gravitational water
following? 1 multiple choice option
What best defines the permanent wilting point soil moisture Water is held by soil but unavailable to plants such that they can't recover
condition? 3 multiple choice options
What soil below most likely has the lowest infiltration rate? Compacted clay
3 multiple choice options
What major soil horizon category is not included in the C
zone designated as topsoil? 3 multiple choice options
What soil type is most easily compacted? Clay
3 multiple choice options
What is not a tree characteristic which helps to prevent the Increased leaf surface area
loss of water? 3 multiple choice options
What irrigation system type provides water slowly to Drip irrigation
specific areas of the tree root zone? 3 multiple choice options
Trees help to control stormwater runoff by all of the All of the above
following means except: 3 multiple choice options
What is not an advantage of the use of mulching? Promote deep root system
3 multiple choice options
