Certified Arborist Test Tree Risk 4

Question 1

What are the three components of tree risk assessment?

Accepted Answer

Likelihood of failure, likelihood of impacting a target, and consequences of impact

Answer

Tree risk is evaluated by assessing: (1) how likely the tree or part is to fail, (2) how likely that failure would hit a target, and (3) the severity of consequences if impact occurs.

Question 2

What risk rating indicates a tree that poses an imminent threat and requires immediate action?

Accepted Answer

Extreme/imminent risk

Answer

Extreme or imminent risk means failure is very likely, a target is present, and consequences could be severe (injury/death, major property damage). Immediate mitigation is required.

Question 3

Co-dominant stems with included bark are considered a significant risk factor because:

Accepted Answer

The bark between stems prevents strong wood union, making splitting more likely

Answer

Included bark between co-dominant stems acts as a wedge, preventing the formation of strong connective wood. This creates a structural weakness where the stems can split apart, especially under load.

Question 4

What is the 'target zone' in tree risk assessment?

Accepted Answer

The area that could be struck by a failing tree or branch, where people or property are present

Answer

The target zone encompasses all areas where people, vehicles, structures, or other valued items could be struck if the tree or a part of it failed. No target = lower risk regardless of tree condition.

Question 5

Which visual symptom is the strongest indicator of potential whole-tree failure?

Accepted Answer

Severe lean with recent root plate lifting and cracked soil

Answer

A severe lean combined with heaving root plate and cracked soil indicates the root system is failing and the tree may fall. This is one of the most critical risk indicators requiring immediate action.

Certified Arborist Test Practice Test

Certified Arborist Test Practice Test

Certified Arborist Test Tree Risk 4