ISA Certified Arborist Study Guide — All 10 Exam Domains
The ISA Certified Arborist exam covers 10 domains. This free preview shows you the key concepts and sample questions for each. The full study guide includes complete notes, mnemonics, and 50 practice questions per domain.
Domain 1: Tree Biology
Key Concepts to Study
- •Xylem and phloem function
- •CODIT model
- •Cambium layer role
Sample Question
"Which vascular tissue transports water and dissolved minerals upward from the roots?"
Domain 2: Diagnosis and Treatment
Key Concepts to Study
- •Abiotic vs biotic disorders
- •Integrated pest management
- •Pathogen identification
Sample Question
"What is the first step in diagnosing a tree disorder?"
Domain 3: Soil Management
Key Concepts to Study
- •Soil pH and nutrient availability
- •Compaction effects
- •Mycorrhizal relationships
Sample Question
"Which soil horizon contains the most organic matter?"
Domain 4: Pruning
Key Concepts to Study
- •ANSI A300 pruning types
- •Branch collar anatomy
- •Three-cut method
Sample Question
"What is the purpose of the first cut in the three-cut method?"
Domain 5: Cabling Bracing and Support
Key Concepts to Study
- •Static vs dynamic cabling
- •Installation standards
- •Inspection intervals
Sample Question
"Where should a support cable ideally be installed in a tree's crown?"
Domain 6: Safe Work Practices
Key Concepts to Study
- •ANSI Z133 standards
- •PPE requirements
- •Rigging systems
Sample Question
"Are ANSI Z133 safety standards mandatory by law?"
Domain 7: Aerial Rescue
Key Concepts to Study
- •Rescue descent techniques
- •Suspended trauma
- •Communication protocols
Sample Question
"What is the most critical factor in an aerial rescue scenario?"
Domain 8: Plant Installation
Key Concepts to Study
- •Proper planting depth
- •Backfill standards
- •Establishment watering
Sample Question
"Where should the structural roots be located when planting a tree?"
Domain 9: Urban Forestry
Key Concepts to Study
- •Tree benefits valuation
- •Species selection criteria
- •Urban heat island
Sample Question
"What term describes the cooling effect trees have on surrounding urban environments?"
Domain 10: Tree Risk Assessment
Key Concepts to Study
- •TRAQ methodology
- •Likelihood and consequence ratings
- •Mitigation options
Sample Question
"What three factors must be present to constitute a tree risk?"
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