Arborist Practice is independent and not affiliated with the International Society of Arboriculture. These are original Tree Risk practice questions written for study. They are not real ISA exam questions, not official ISA material, and not a replacement for the current ISA exam outline or professional tree risk assessment training.
Practice the risk reasoning, not just defect names
Free ISA Tree Risk practice questions are useful because this domain is easy to over-simplify. The exam is not only asking whether you can recognize a crack, cavity, dead limb, lean, included bark, or root damage. It is asking whether you can connect the condition to a target, likely consequences, inspection limits, and a mitigation option that fits the situation.
Use this set as a focused Tree Risk drill. Answer all 15 questions before checking the explanations. If you miss several target, likelihood, consequence, or mitigation items, review the ISA tree risk assessment exam guide before returning to mixed practice.
For broader prep, use the mixed free ISA Certified Arborist practice questions. If your misses involve job-site exposure, electrical hazards, traffic control, rigging, or worker safety, pair this page with free ISA Safe Work Practices practice questions. For full-test pacing, use the ISA Certified Arborist practice test guide after your domain misses become predictable.
How to take this Tree Risk quiz
Treat this as a scenario-reading check, not a score prediction:
- Give yourself 20 minutes for all 15 questions.
- Mark each answer as confident, uncertain, or guessed.
- For every miss, label the reasoning gap: defect, target, likelihood of failure, likelihood of impact, consequence, inspection level, or mitigation.
- Write why the tempting wrong answer was too aggressive, too passive, or not supported by the facts.
- Retest weak categories before taking another full mock.
The ISA Certified Arborist exam outline is controlled by ISA and can change. Use the official ISA Certified Arborist credential page and the exam outline PDF as the source of truth for current domain wording and exam details.
15 ISA Tree Risk practice questions
1. Target changes the priority
A mature tree has a large dead branch over a playground that is used every weekday afternoon. What factor most directly increases the risk concern?
A. The tree is mature
B. The branch is dead and positioned over an occupied target
C. The playground has mulch below it
D. The tree has been pruned in the past
Answer: B. A defect matters more when it can affect an occupied target. The exam often tests the connection between what could fail and what it could hit. Maturity and past pruning may matter during inspection, but they do not answer the risk question as directly.
2. Defect without an occupied target
A dead limb of similar size is found over a fenced, unused woodland edge with no structures, trails, benches, utilities, or regular access below it. What is the best interpretation?
A. The limb creates the same risk as a limb over a busy sidewalk
B. The target exposure is lower, so the risk picture changes
C. The limb is safe because dead branches never fail in woodland settings
D. The tree must be removed immediately
Answer: B. Risk is not only defect severity. Target presence and occupancy affect likelihood of impact and consequences. A dead limb can still fail, but the management priority is different when there is no regular target beneath it.
3. Likelihood of failure vs. impact
A large branch has a visible crack, but the area below it has been closed and fenced until work can be scheduled. What changed first?
A. The likelihood that the cracked branch will fail
B. The species of the tree
C. The likelihood that failure will impact a person or property
D. The amount of decay inside the branch
Answer: C. Closing the target area does not repair the crack or reduce the branch's likelihood of failure. It can reduce the likelihood of impact by keeping people and property out of the strike zone.
4. Recent lean with soil movement
After heavy rain, a tree near a parking area has a new lean, soil cracking on one side, and slight root plate movement. What is the best first response?
A. Fertilize the tree to restore root strength
B. Restrict access to the target area and arrange prompt assessment
C. Wait until the leaves wilt before acting
D. Reduce the entire crown by half immediately
Answer: B. Recent lean plus soil movement and target exposure can indicate anchorage concern. The first move is to control exposure and get the condition assessed. Fertilizer does not solve immediate instability, and heavy crown reduction is not a default answer.
5. Long-standing lean
A tree has leaned away from all targets for many years. There is no soil cracking, no root plate movement, no fresh cracks, and no recent excavation. Which answer is most defensible?
A. Lean alone requires immediate removal
B. The lean should be interpreted with site history, targets, and other defects
C. The tree is guaranteed safe forever
D. Cabling is always required for leaning trees
Answer: B. A lean is context, not an automatic prescription. Long-standing adaptive lean differs from a new lean with root movement. The exam usually rewards inspection and context over automatic removal or automatic support.
6. Included bark and codominant stems
A young tree has codominant stems with included bark above a walkway. Which statement best describes the risk concern?
A. Included bark can create a weaker union, and the target below affects priority
B. Included bark improves stem attachment
C. The walkway does not matter because the tree is young
D. The only acceptable response is immediate whole-tree removal
Answer: A. Included bark can reduce the strength of a union, especially as stems grow and loading increases. The walkway matters because it is a target. Mitigation might involve structural pruning, monitoring, support, or removal depending on severity and context.
7. Cavity language
A tree has a cavity in the trunk, but the question gives no information about cavity size, remaining sound wood, species response, targets, or recent change. What is the best exam-style reaction?
A. Assume every cavity requires immediate removal
B. Assume every cavity is harmless
C. Recognize that more inspection information is needed before choosing a final prescription
D. Ignore the cavity because only dead branches matter
Answer: C. A cavity is a warning sign, not a complete risk assessment by itself. The exam may test whether you know what information is missing: extent of decay, residual wall strength, targets, occupancy, history, and site conditions.
8. Consequences
Two similar dead limbs are likely to fail. One is over a storage shed with people rarely nearby; the other is over a school pickup line used daily. Which concept explains why the second case is usually higher priority?
A. Soil texture
B. Consequences and occupancy of the target
C. Leaf arrangement
D. Fertilizer timing
Answer: B. Consequences complete the risk picture. The same likelihood of failure can create different management priorities when target occupancy and potential harm differ.
9. Mitigation fits the risk
A large dead branch extends over a frequently used sidewalk. The tree is otherwise structurally sound. Which mitigation best matches the described problem?
A. Remove or prune the hazardous dead branch and control the target area until work is completed
B. Remove the entire tree automatically
C. Fertilize the tree and check again next year
D. Top the tree to reduce height
Answer: A. The described risk is a dead branch over a target. Removing the branch and controlling exposure address the problem directly. Whole-tree removal may be excessive if the tree is otherwise sound, and fertilizer or topping does not manage the immediate branch risk.
10. Construction root damage
A preserved tree next to a new driveway has recent trenching through the root zone, canopy thinning, and a target area where cars park daily. What should you consider first?
A. Root damage may affect stability and health, and target exposure affects risk priority
B. Parking near the tree guarantees the roots are healthy
C. Canopy thinning proves the tree has no structural concern
D. The driveway removes the need for inspection
Answer: A. Root loss can affect both health and anchorage. Construction history plus target exposure should trigger careful inspection and proportional risk management. For related protection-zone logic, review the ISA Trees and Construction exam questions guide.
11. Further assessment
A client sends one close-up photo of a fungal conk on a trunk and asks whether the tree must be removed. No target, species, decay extent, canopy condition, or site history is provided. What is the best answer?
A. Recommend removal from the photo alone
B. Recommend no action because fungi are always harmless
C. Explain that the conk is significant but a proper site inspection is needed before a defensible recommendation
D. Tell the client to fertilize immediately
Answer: C. Fungal fruiting bodies can be important signs, but one photo rarely gives enough information for a final prescription. Tree Risk questions often reward knowing when the next step is more appropriate inspection, not an unsupported treatment.
12. Target control as temporary mitigation
A cracked limb over a busy trail cannot be pruned until tomorrow morning. What temporary mitigation is most appropriate?
A. Leave the trail open and add a small warning sign near the trunk
B. Close or reroute the trail to keep people out of the target zone until the limb is addressed
C. Water the tree heavily overnight
D. Ask visitors to walk quickly under the tree
Answer: B. Temporary target control can reduce exposure until the defect is mitigated. A small sign may not keep people out of the strike zone, and watering does not manage the immediate risk.
13. Over-treatment trap
A low-use park tree has a small dead branch over a mulched bed with no regular pedestrian access. Which answer is most likely over-treatment if no other defects or targets are described?
A. Document the condition and schedule appropriate pruning or monitoring based on site policy
B. Consider whether any target exposure exists
C. Remove the entire tree immediately
D. Continue inspection for other relevant defects
Answer: C. Removal can be correct in severe cases, but the facts here do not support maximum intervention. Tree Risk questions often include aggressive answers that sound safe but are not proportional to the described risk.
14. Risk and safety overlap
A tree has a fractured limb over a road, and traffic is moving directly below the work area. What issue must be handled before pruning starts?
A. The tree's autumn color
B. Traffic and work-zone control for the target area
C. Whether the client prefers a natural shape
D. Fertilizer selection
Answer: B. Tree Risk identifies the limb and target; Safe Work Practices controls the work exposure. Roadside pruning requires traffic and work-zone control before workers enter the hazard area or material is cut.
15. Communicating uncertainty
An arborist observes several possible defects but cannot determine decay extent from a basic visual inspection. Targets are present, and the client wants a yes-or-no answer immediately. What is the best response?
A. Give a definitive answer anyway to satisfy the client
B. Explain the limits of the inspection, manage obvious exposure if needed, and recommend a more appropriate assessment level
C. Ignore the defects because uncertainty means no risk
D. Recommend topping as a universal risk fix
Answer: B. Professional judgment includes communicating limits. If the available information is not enough, the best answer may be exposure control plus a higher level of assessment rather than a premature final prescription.
Score guide
Use the score to choose the next study action:
- 13-15 correct: Tree Risk probably is not your main leak. Review uncertain answers, then test adjacent domains like Safe Work Practices, Trees and Construction, and Diagnosis and Treatment.
- 9-12 correct: You understand the general pattern but still miss scenario details. Review whether your misses came from ignoring targets, overreacting to defects, or choosing unsupported mitigation.
- 0-8 correct: Pause mixed mocks. Relearn targets, likelihood of failure, likelihood of impact, consequences, defects, mitigation, and inspection limits before continuing.
A short quiz cannot predict your real exam score. The useful signal is the pattern. Missing three target questions is different from missing three defect-identification questions.
What Tree Risk questions usually test
Tree Risk questions usually test whether you can keep the whole scenario in view:
- Targets: Can you identify what people, property, utilities, roads, structures, or site uses could be affected?
- Defects: Can you recognize conditions such as dead branches, cracks, decay, cavities, conks, included bark, weak unions, root damage, and new lean?
- Likelihood: Can you separate likelihood of failure from likelihood of impact?
- Consequences: Can you judge why size, occupancy, and target value change priority?
- Mitigation: Can you choose an action that fits the described risk without under-reacting or over-treating?
- Inspection limits: Can you notice when the available information is not enough for a final recommendation?
If an answer ignores the target, treats every defect as automatic removal, or delays action when exposure is obvious, be skeptical.
After this quiz
Review the ISA tree risk assessment exam guide and write down the reasoning pattern behind every miss. If construction damage, root-zone protection, or grade changes caused trouble, use the Trees and Construction exam questions guide. If the hard part was keeping workers, pedestrians, or traffic out of harm's way, use the Safe Work Practices practice questions.
When you are ready for broader timing practice, use Arborist Practice for focused Tree Risk sets, mixed domain quizzes, bookmarks, explanations, and timed mock exams. Use official ISA materials for credential rules and exam policies; use independent practice questions to measure whether your reasoning holds up under test conditions.
FAQ
Are these real ISA Tree Risk exam questions?
No. They are original study questions written for practice. They are not official ISA questions and should not be treated as a leaked exam bank.
Is Tree Risk the same as TRAQ?
No. The Certified Arborist exam includes a Tree Risk domain, but TRAQ is a separate ISA qualification with its own training and assessment. These questions are for Certified Arborist exam prep, not TRAQ certification.
What is the biggest Tree Risk mistake on practice tests?
Ignoring the target. Many candidates see a defect and jump straight to removal or treatment. A stronger answer asks what could fail, what it could hit, how often the target is occupied, what the consequences would be, and which mitigation fits.
Should I study Tree Risk before Safe Work Practices?
Study both. Tree Risk is about assessing tree conditions and targets. Safe Work Practices is about performing work safely. The domains overlap in judgment, but they test different decisions.