Certified Arborist Test Tree Biology and Structure 2

Question 1

What is the primary function of the cambium layer in a tree?

Accepted Answer

Producing new xylem and phloem cells

Answer

Photosynthesis and sugar production

Answer

Storing water and nutrients

Answer

Absorbing minerals from the soil

Question 2

Which of the following best describes the process of transpiration in trees?

Accepted Answer

Loss of water vapor from leaf stomata driving sap ascent

Answer

Movement of sugars from leaves to roots via phloem

Answer

Conversion of CO2 to glucose during photosynthesis

Answer

Uptake of water by root hair cells through osmosis

Question 3

What is the CODIT model primarily used to describe?

Accepted Answer

Compartmentalization of Decay in Trees

Answer

Carbon dioxide distribution through tree tissue

Answer

Crown density index for tree vigor

Answer

Caliper and diameter increment tracking

Question 4

In tree physiology, what is 'girdling' and what is its primary consequence?

Accepted Answer

Disruption of the phloem causing starvation of roots

Answer

Removal of lateral branches to redirect growth energy

Answer

Pruning of adventitious roots to improve structural stability

Answer

Defoliation that reduces photosynthetic capacity temporarily

Question 5

What is the role of lenticels on tree bark?

Accepted Answer

Allowing gas exchange between internal tissues and the atmosphere

Answer

Producing resin to repel insect borers

Answer

Anchoring epiphytes and mosses to the bark surface

Answer

Absorbing water during periods of low soil moisture

Question 6

What is the primary purpose of tyloses in xylem vessels?

Accepted Answer

Plugging vessels to compartmentalize wounds and slow decay

Answer

Conducting water more efficiently during drought stress

Answer

Storing non-structural carbohydrates for winter dormancy

Answer

Producing ethylene to signal stress responses