CATS Biology and Physiology 3

Question 1

What is CODIT (Compartmentalization of Decay in Trees) primarily used to describe?

Accepted Answer

How trees chemically wall off wounded or infected wood

Answer

CODIT describes the four walls trees use to chemically and structurally limit the spread of decay organisms into healthy wood after injury.

Question 2

In the CODIT model, which wall is considered the strongest barrier against decay spread?

Accepted Answer

Wall 4 — separates old wood from new growth

Answer

Wall 4, formed by the vascular cambium, is the strongest CODIT barrier and separates wood present at the time of wounding from new wood formed afterward.

Question 3

What is the term for the boundary zone of discolored wood that forms around a wound before callus tissue develops?

Accepted Answer

Reaction zone

Answer

The reaction zone is chemically altered wood surrounding a wound that forms the initial defensive barrier against pathogen spread.

Question 4

Which of the following best describes 'included bark' in tree structure?

Accepted Answer

Bark embedded between two codominant stems

Answer

Included bark occurs when bark tissue becomes embedded between two codominant stems, creating a structurally weak union prone to failure.

Question 5

What term describes the annual addition of new wood by the vascular cambium that produces visible growth rings?

Accepted Answer

Secondary growth

Answer

Secondary growth refers to the increase in girth produced by the vascular cambium, creating successive layers of xylem and phloem visible as annual rings.

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

CATS Biology and Physiology 3