ISA Tree Risk & Management 2

Question 1

Which term describes the probability that a specific tree failure will occur within a defined time period?

Accepted Answer

Likelihood of failure

Answer

Likelihood of failure is the probability that a tree part or whole tree will fail under a given set of conditions.

Question 2

A 'target' in tree risk assessment refers to:

Accepted Answer

People, property, or activities that could be harmed by tree failure

Answer

A target is any person, property, or activity in the vicinity of the tree that could be injured or damaged if the tree or a part of it fails.

Question 3

When assessing tree risk, 'occupancy rate' refers to:

Accepted Answer

How often a target is present in the impact zone

Answer

Occupancy rate describes how frequently a target (person, vehicle, etc.) is present in the area where it could be struck by a failing tree part.

Question 4

Which of the following best describes 'residual risk' in tree risk management?

Accepted Answer

Risk that remains after mitigation measures are implemented

Answer

Residual risk is the level of risk that remains after risk mitigation treatments or actions have been applied to a tree.

Question 5

A tree with a large stem cavity but no visible crown symptoms would best be evaluated using:

Accepted Answer

Advanced assessment tools such as resistograph or sonic tomography

Answer

Advanced assessment tools like resistographs and sonic tomography help quantify internal decay that may not be apparent from external visual inspection.

(ISA) ISA Certified Arborist Practice Test

(ISA) ISA Certified Arborist Practice Test

ISA Tree Risk & Management 2