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

Height, width, and age

Answer

Species, location, and soil type

Answer

Trunk diameter, crown spread, and root depth

Question 2

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

Accepted Answer

Extreme/imminent risk

Answer

Low risk

Answer

Moderate risk

Answer

High risk

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

They produce too much shade

Answer

They attract more insects

Answer

They grow faster than single-leader trees

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 area where pruning cuts should be made

Answer

The root zone of the tree

Answer

The area selected for pesticide application

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

Minor leaf discoloration

Answer

One dead branch in the upper crown

Answer

Epicormic sprouting on the trunk

Question 6

How does the presence of a target affect the risk rating of a tree with structural defects?

Accepted Answer

It significantly increases the risk rating

Answer

It has no effect on the rating

Answer

It decreases the rating because targets can be moved

Answer

Targets only matter for trees over 50 feet tall