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ISA Certified Arborist (2025 / 2026) Practice Exam with 200 Questions and Answers, Exams of Nursing

ISA Certified Arborist Exam (2025 / 2026) Test Questions and Verified Rationalized Answers, 100% Passing Score Guarantee • ISA Certified Arborist Exam 2025 study guide PDF download • Free practice questions for ISA Arborist Certification 2025 • ISA Certified Arborist Exam 2025 test bank with explanations • Best online prep course for ISA Arborist Exam 2025 • ISA Certified Arborist Exam 2025 final exam sample questions • How to pass the ISA Arborist Certification test in 2025 • ISA Certified Arborist Exam 2025 practice test with answers • Top study tips for ISA Arborist Exam 2025 success • ISA Certified Arborist Exam 2025 flashcards and mnemonics • What to expect on the ISA Arborist Certification test 2025 • ISA Certified Arborist Exam 2025 study schedule and plan • Most challenging topics on ISA Arborist Exam 2025 • ISA Certified Arborist Exam 2025 practice questions by domain • How many questions are on the ISA Arborist Exam 2025

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ISA Certified Arborist Practice Exam
Questions and Verified Answers
100% Guarantee Pass Score
test consisting of 200 multiple-choice ques with Ans
1. Which layer of cells is responsible for outward trunk growth and increased
girth of a tree?
- cambium
- pith
- epidermis
- cortex
Answer>
cambium
2. Douglasfir (Pseudotsuga menziesii) differs from balsam fir (Abies bal-
samea) in that
- they are not in the same genus
- they are not in the same family
- Douglas fir is actually a type of hemlock
- balsam fir is not a conifer
Answer>
they are not in the same genus
Joshua
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ISA Certified Arborist Practice Exam

Questions and Verified Answers

100% Guarantee Pass Score

test consisting of 200 multiple-choice ques with Ans

  1. Which layer of cells is responsible for outward trunk growth and increased girth of a tree?
  • cambium
  • pith
  • epidermis
  • cortex

Answer> cambium

  1. Douglasfir (Pseudotsuga menziesii) differs from balsam fir (Abies bal- samea) in that
  • they are not in the same genus
  • they are not in the same family
  • Douglas fir is actually a type of hemlock
  • balsam fir is not a conifer

Answer> they are not in the same genus

Joshua

  1. Mycorrhizae are
  • collar rot fungi
  • elongated underground stems producing sucker sprouts
  • symbiotic relationship between fungi and roots
  • cells in which photosynthesis takes place

Answer> symbiotic relationship between fungiand roots

  1. When two leaves and/or buds are located at the same node on a twig, the arrangement is called
  • opposite
  • alternate
  • whorled
  • compound

Answer> opposite

  1. Correct way of writing scientific name
  • Quercus Rubra
  • Quercus rubra
  • quercus Rubra
  • quercus rubra

Answer> Quercus rubra

  1. When cutting through a tree with a chainsaw or drilling into a tree you would pass through (in order)
  • bark, cambium, phloem, xylem

Joshua

  • Cornus (dogwoods)

Answer> Quercus (oaks)

  1. Which conifers have needles in bundles
  • hemlocks
  • firs
  • pines
  • spruces

Answer> pines

  1. Most of the fine absorbing roots are typically found near the soil surface because
  • roots grow where conditions are favorable
  • roots need UV light to drive respiration
  • the Ph of the soil is generally higher near the surface
  • phosphorus and potassium are more available

Answer> roots grow where conditionsare favorable

  1. Microorganisms tend to congregate in the rhizosphere, in part because
  • sugar exudates from root tips are a source of food
  • mycorrhizae fix nitrogen and make it available
  • root hairs tend to collect cations essential to microorganism growth
  • bacteria preferentially feed on the meristem tissue at the root tips

Answer> sugarexudates from root tips are a source of food Joshua

  1. If a planting hole in a clay soil site is backfilled with sandy soil,
  • drainage will improve
  • nutrients will be more available
  • water will drain very slowly out of the planting hole
  • improve texture of backfill will reduce chances of girdling roots forming

Answer> water will drain very slowly out of the planting hole

  1. When soil is compacted
  • micropores combine to form macropores
  • soil particles are broken up giving the soil a finer texture
  • a high water content will reduce the damaging effects
  • total pore space and the percentage of macropores are reduced

Answer> total porespace and the percentage of macropores are reduced.

  1. a characteristic of sandy soils in arid regions is that they
  • tend to become alkaline, and salts build up due to the lack of heavy rainfall.
  • tend to become acid because basic ions leach out
  • are fine in texture due to high sand content
  • have a high-water holding capacity because rainfall is scarce

Answer> tend to becomealkaline, and salts build up due to the lack of heavy

rainfall.

  1. When irrigating trees

Joshua

  • Less frequent waterings of longer duration will reduce the likelihood of salt buildup,
  • water hitting the soil surface can lead to crusting,
  • application rates that exceed absorption can lead to runoff.
  • all of the above

Answer> All of the above

  1. In sites where poor drainage can be a problem, which will NOT help to ensure plant survival pg 66
  • careful plant selection and shallow planting
  • improvement of surface drainage by changing the grade, or trenching
  • installation of drain tiles
  • placing gravel in the bottom of the planting hole and backfilling with a sandy soil

Answer> placing gravel in the bottom of the planting hole and backfillingwith a

sandy soil

  1. An 80-pound bag of 10-6-4 fertilizer contains how many pounds of actual nitrogen? pg
  • 6
  • 8
  • 10
  • 4

Answer> 8

Joshua

  1. A complete fertilizer contains pg
  • All 16 essential elements
  • nitrogen, phosphorus, potassium
  • organic and in-organic nitrogen
  • equal amounts of N, P and K

Answer> nitrogen, phosphorus, potassium

  1. A tree may not respond immediately to fertilizer application if pg
  • a slow-release fertilizer was applied,
  • there is inadequate soil moisture,
  • the tree is not actively growing,
  • all of the above

Answer> all of the above

  1. A soil test may not identify a nutrient deficiency problem in a plant because pg
  • the tests are not reliable
  • the nutrient content can change after collecting
  • the soil may contain adequate nutrients, but something may be inhibiting uptake
  • no one knows which levels of nutrients in soils are adequate

Answer> the soil maycontain adequate nutrients, but something may be

inhibiting uptake

  1. Sulfur-coated urea or urea formaldehyde is sometimes included in nitro- gen fertilizers because pg

Joshua

  1. Climatic factor that determines hardiness zones is pg
  • north-south location
  • temperature, rainfall and winds
  • east-west location
  • low temperature extremes

Answer> low temperature extremes

  1. Trees to be planted under utility lines should be pg
  • tolerant of heavy top pruning
  • low-growing to remain below the lines
  • vase-shaped or overarching to clear conductors
  • all of the above

Answer> low growing to remain below the lines.

  1. Some trees acclimate to shade conditions by pg 92
  • developing larger leaves
  • developing thinner leaves
  • variegated foliage losing variegation, or colored foliage tending to be greener
  • All of the above

Answer> All of the above

  1. Fastigiate trees have a growth form that is pg
  • upright
  • weeping
  • overarching
  • vase-shaped

Answer> upright

Joshua

  1. Some tree species are adapted to hot, dry, or bright light conditions with small, thick foliage and sunken stomata.
  • true
  • False

Answer> True

  1. Staking or guying when planting a tree is pg
  • done only for bare root trees
  • not necessary for trees greater than 6 inches (15 centimeter) diameter
  • not always required or necessary.
  • for promoting a larger and stronger root system and better trunk taper

Answer> not always required or necessary.

  1. Planting a row of palms at various depths to create a row of uniform height pg113.
  • will not be harmful as long as the soil is sandy and well drained
  • can lead to death of the deeply planted trees
  • is acceptable due to the deep rooting of palms
  • is recommended to achieve deep rooting in sandy soils

Answer> can lead to death ofthe deeply planted trees

Joshua

  • codominant branching can be avoided
  • all of the above

Answer> all of the above

  1. To prune trees that flower on the previous year's growth and maximize flowering you should prune pg
  • any time during the dormant season
  • shortly after flowering
  • in late summer after seed formation
  • in the fall just after leaf drop

Answer> shortly after flowering

  1. When pruning a branch from a tree, the final cut should be pg
  • flush with the parent stem
  • at a 45° angle to the parent stem
  • parallel to the branch bark ridge
  • just outside the branch collar

Answer> just outside the branch collar

Joshua

  1. When it comes to pruning as a rule, mature trees are pg
  • more tolerant of extremes than young tree
  • capable of tolerating heading
  • not tolerant of severe pruning
  • unlikely to produce watersprouts

Answer> not tolerant of severe pruning

  1. If the height of a tree must be reduced pg
  • branches should be removed at their point of origin or to a lateral large enough to assume the terminal role
  • all cuts should be made at internodes to avoid cutting through buds
  • the tree should be root pruned to compensate for foliage loss
  • all of the above

Answer> branches should be removed at their point of origin or to a laterallarge

enough to assume the terminal role

  1. An advantage of the amon-eye system, over the use of an eye bolt is pg
  • no washers are needed on the terminations
  • the length of the rod can be adjusted
  • they are considered stronger than eye bolts
  • the eye bolt is not a drop-forged

Answer> the length of the rod can be adjusted

  1. The purpose of a lightning protection system is pg
  • reduce the voltage of the strike
  • prevent the tree from being struck
  • to conduct the electrical charge into the soil away from the tree

Joshua

  • installing the cables low in the tree with turnbuckles that can be tightened from the ground
  • all of the above

Answer> cabling the limbs together in triangular combinations

  1. A condition characterized by a cluster of dwarfed shoots on affected twigs is called pg
  • witch's broom
  • anthracnose
  • chlorosis
  • Verticillium wilt

Answer> witch's broom

  1. Twig dieback from periodical cicadas is primarily a result of pg
  • ovipositing (egg-laying)
  • adults feeding on the foliage
  • larvae feeding on the roots
  • feeding-induced galls on the twigs and foliage

Answer> ovipositing (egg-laying)

  1. Plant damage associated with a sap-feeding insect pest might appear as pg
  • leaves that have been skeletonized
  • distorted leaves or shoots
  • leaf mines or blotches
  • webs or tents in the tree

Answer> distorted leaves or shoots

  1. Scale damage to plants is the result of pg

Joshua

  • fungal spore growth depleting xylem reserves
  • Phloem-feeding insects causing a loss of vigor
  • vascular damage from fungal invasion
  • a physiological disorder due neither to insects nor to disease

Answer> Phloem-feedinginsects causing a loss of vigor

  1. Damage caused by non-living factors tend to be pg
  • Uniform with definite borders
  • uniform, but generally not affecting the new growth
  • random and concentrated on the new growth
  • random with irregular borders

Answer> Uniform with definite borders

  1. Plant Health Care is a comprehensive program to manage pg
  • insects and disease of plants
  • tree health without the use of pesticides
  • the appearance, structure, and health of plants
  • pests, pathogens, and abiotic disorders of trees

Answer> the appearance, structure andhealth of plants

  1. The mortality spiral describes the pg
  • process off infection and spread of disease in a tree

Joshua

Answer> biological control

  1. A necessary component in the existence of tree risk is pg
  • a tree with a potential for failure,
  • an environment that may contribute to failure,
  • a person or object that may be injured or damaged
  • all of the above

Answer> all of the above

  1. Which type of decay primarily affects the lignin within and between cell walls in the wood, reducing the tree's compressive strength?pg
  • brown rot
  • white rot
  • soft rot
  • sapwood rot

Answer> white rot

  1. Following construction, forest trees on the edge of remaining stands are prone to failure due to pg
  • losing the protection of the trees that used to surround them,
  • less trunk stability and poor taper,

Joshua

  • increased exposure to the weather elements
  • all of the above

Answer> all of the above

  1. Trees that lean because of ground failure or root injury pg
  • have a high potential to fail
  • are less of a risk than those that lean due to phototropism
  • are not a thread unless located at the edge of a wooded area
  • are a risk only if they begin to grow in compensation for the lean

Answer> have a highpotential to fail

  1. Arborists, as trained professionals in tree care, pg
  • are required to have formal training in risk assessment
  • must be qualified to perform a root crown inspection
  • Will be held to a higher standard of care than general citizens.
  • all of the above

Answer> Will be held to a higher standard of care than general citizens.

  1. When soils are compacted by construction equipment, trees usually de- cline because
  • Oxygen availability is reduced,
  • the ability of the roots to absorb water and minerals decreases,
  • root growth and expansion may be diminished
  • all of the above

Answer> all of the above

  1. Arborists should be involved early in the construction planning process because pg
  • tree preservation measures should be in the specifications,

Joshua