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ISA Certified Arborist VIP Practice Exam II
ISA — The ISA Certified Arborist exam is administered by the International Society of Arboriculture; it consists of approximately 200 multiple-choice questions across 8 domains (Tree Biology, Soil & Water Management, Diagnosis & Treatment, Tree Risk Management, Pruning, Urban Forestry, Safety, and Aerial/Climbing) with a passing score typically around 76%.
29
Questions
120m
Time Limit
76.00%
To Pass
Question 1 of 29👑 VIP
You are assessing a 60-year-old red oak (Quercus rubra) growing in a suburban yard. The homeowner reports that the tree dropped several large scaffold limbs during last summer's drought with no prior wind event. The remaining crown looks sparse, with leaves that are undersized and pale green. Closer inspection reveals fine root growth concentrated near the soil surface and compacted clay soil beneath. Which physiological process best explains the sudden limb failures observed during the drought?
Questions 2–29 and full explanations are VIP-exclusive.