ISA Certified Arborist – Introduction Exam
*Q&A* (100% Correct) 2025/2026
|VERIFIED|
What is the primary goal of arboriculture?
The care and management of individual trees and shrubs in a landscape setting
Name one of the key physiological processes trees rely on to produce food. ...
ISA Certified Arborist – Introduction Exam
*Q&A* (100% Correct) 2025/2026
|VERIFIED|
What is the primary goal of arboriculture?
The care and management of individual trees and shrubs in a landscape setting
Name one of the key physiological processes trees rely on to produce food.
Photosynthesis
What is the cambium layer's primary function in a tree?
To produce new cells for the inner bark and sapwood
Explain the role of xylem tissue in trees.
Transport water and nutrients from the roots to the leaves
Define the process of transpiration in trees.
The release of water vapor from the leaves into the atmosphere
What does CODIT stand for in tree biology?
Compartmentalization of Decay in Trees
What is a common sign of decay in trees?
Presence of fruiting bodies like mushrooms or conks
Name a tool used for determining the root flare during tree planting.
Spade or soil knife
1
,What is one major benefit of mulching around trees?
Conserves moisture in the soil and reduces temperature extremes
Why should pruning cuts be made just outside the branch collar?
It minimizes the wound size and promotes proper healing
Describe one of the benefits of proper tree pruning.
Improves tree structure and reduces the risk of branch failure
How does soil compaction negatively affect trees?
Reduces soil aeration and limits root growth
What is an example of an abiotic disorder in trees?
Sunscald
What is the function of phloem in a tree?
Transports sugars and other organic compounds
Why is it critical to maintain the root zone of a tree?
To ensure proper nutrient and water uptake
What is a common symptom of nutrient deficiency in trees?
Yellowing leaves or chlorosis
What is the purpose of staking a newly planted tree?
Provides support until the root system establishes
When is the best time to prune most deciduous trees?
2
, During dormancy (late winter to early spring)
Describe one negative impact of improper topping practices on trees.
Leads to weak, poorly attached branches
Why is it recommended to maintain a tree’s natural form during pruning?
Enhances the tree’s structural integrity and appearance
Define “girdling roots.”
Roots that encircle and compress the tree trunk or other roots
What is a primary goal of integrated pest management (IPM) in arboriculture?
To manage pests with minimal impact on the environment
Explain how trees absorb nutrients from the soil.
Through root hairs that actively take up minerals
Why should mulch not touch the tree trunk?
Prevents moisture buildup, reducing the risk of decay and pests
What is the purpose of root pruning?
To encourage new, fine root growth before transplanting
Identify one factor to consider when selecting a tree for planting.
Hardiness zone suitability
What are included in the three primary macronutrients for trees?
Nitrogen (N), Phosphorus (P), and Potassium (K)
3
, What is the primary function of the cuticle on leaves?
To reduce water loss and protect against disease
Describe a method to assess soil compaction around a tree.
Using a penetrometer or soil probe
Explain the concept of tree crown reduction.
Reducing the height or spread of a tree's canopy
Why is water important for photosynthesis in trees?
It is used in the conversion of sunlight, carbon dioxide, and water into energy
What effect does proper irrigation have on newly planted trees?
Helps establish a strong root system
Why are air pockets problematic when planting trees?
They can dry out roots and hinder establishment
How does mycorrhizal fungi benefit tree roots?
Enhances nutrient and water uptake
What is the most common cause of tree decline in urban areas?
Stress from poor site conditions, such as compacted soil
Why is crown thinning used in arboriculture?
To allow more light and air penetration throughout the crown
4
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