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ISA Certified Arborist VIP Practice Exam III
ISA — The ISA Certified Arborist exam is administered by the International Society of Arboriculture (ISA); it consists of 200 multiple-choice questions, allows 4 hours, and covers 11 weighted domains including tree biology, pruning, diagnosis, risk management, and safety per the ISA Certified Arborist Candidate Handbook.
56
Questions
90m
Time Limit
75.00%
To Pass
Question 1 of 56👑 VIP
During a post-storm assessment, you observe a large red oak with a co-dominant stem that split partially during the storm. The wound is fresh, exposing roughly 40% of the cross-section. The tree is in a high-occupancy park. According to the CODIT (Compartmentalization of Decay in Trees) model, which wall is considered the STRONGEST barrier limiting decay spread axially (up and down the trunk)?
Questions 2–56 and full explanations are VIP-exclusive.