FREE ISA Certified Arborist Exam Guide 2026: All 10 Domains
Video
What is the primary function of the vascular cambium in a tree trunk?
Arborist Tree Biology
Question · Easy
Free 2026 ISA Certified Arborist guide: 10 domains with weights, 200-question format, 76% passing score, ANSI A300/Z133, eligibility, fees, and a 12-week study plan.
Blog
CODIT (Compartmentalization Of Decay In Trees)
Tree Biology
Flashcard
Which tissue is responsible for transporting sugars from the leaves to other parts of the tree?
Acronym for the model that uses walls and plugs to explain how a woody plant confines injured or infected wood.
Tree biology
Guess the Term
Orientation: ISA Certified Arborist Eligibility, Fees, Format, Scoring, and Recertification
1.1 Credential Purpose and Professional Scope
Study guide
Cheat sheet
What is the primary site of photosynthesis in a tree?
Question · Medium
Read the clue and guess the term in 6 tries.
Game
CODIT's four walls
During which process do trees release water vapor through their leaves?
Wood tissue that carries water and dissolved substances upward.
What is the CODIT model in arboriculture?
Cohesion-tension mechanism
Which of the following is NOT one of the four walls described in the CODIT model?
Question · Hard
Taxonomic category made up of related species and used as the first word of a scientific name.
Identification
1.2 Eligibility: Full-Time Arboricultural Experience
What is the primary function of stomata in leaves?
Swap tiles to line up three of the same term.
Term Match
Xylem vs. phloem
In which type of root system do trees develop a prominent central taproot with smaller lateral roots?
Paired winged fruit of a maple whose papery wings can carry it far on the wind.
What is the primary function of respiration in trees?
Vascular cambium
Which meristematic tissue is responsible for the elongation of roots and shoots?
Soil separate made of particles smaller than 0.002 mm.
Soil management
1.3 Education, Training, and Apprenticeship Routes
What is the significance of the heartwood in a mature tree trunk?
Flip two cards at a time to find matching terms.
Term Pairs
Reaction wood: tension wood vs. compression wood
Which environmental factor most directly triggers the formation of reaction wood in leaning trees?
Trunk ___: widened, curving base of a tree that may be buried under excess soil on a balled-and-burlapped or container tree.
Installation
What is the primary role of mycorrhizal fungi in tree health?
Binomial nomenclature format
Tree Identification and Selection
What process occurs when a tree loses leaves in response to drought conditions?
Organic material spread 2 to 4 inches deep over the backfilled area and pulled away from the trunk.
1.4 Documentation, Application, and Fee Planning
Which cells in the xylem are responsible for water transport in hardwood trees?
Find five hidden terms in a grid of letters.
Term Search
MAD-Cap-Horse mnemonic
What is the cohesion-tension theory in plant physiology?
Zone at the underside of a branch base, formed from stem tissue, that a proper removal cut avoids injuring.
Pruning
Which of the following is a characteristic feature of coniferous trees?
Arborist Tree Identification
Distinguishing a leaf from a leaflet
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