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Test your tree knowledge

Below are 15 questions from International Society of Arborist exam to become an arborist. The ISA certifies arborist around the world.

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The growth rings of a tree
A. are visible because of the rapid growth rate of early wood relative to late wood
B. can be counted to approximate a tree's age
C. can give information about growing conditions in previous years
D. all of the above

 

The most fibrous and absorptive portion of a tree's root system is found
A. in the upper 6 inches of soil
B. deeper than12 inches in the soil to protect against drought and temperature extremes
C. immediately surrounding the trunk
D. connected to the tap root

 

Which of the following is a true statement
A. lowland tree species will always grow well in wet soils
B. forest understory plants tend to make good street trees because they don't grow tall
C. some tree species are adapted to hot, dry or bright light conditions with small, thick foliage and sunken stomata
D. most evergreen conifers are very shade tolerant and tend to scorch in full sunlight

 

With sprinkler irrigation....
A. Less frequent watering of longer duration will lessen the likelihood of salt buildup
B. Water hitting the soil surface can lead to crusting
C. Applications rates that exceed absorption can lead to runoff
D. All of the above

 

The most important reason to prune a tree when transplanting is
A. to compensate for root loss
B. to invigorate the tree
C. to reduce growth at the tips
D. to remove structurally weak or damaged branches.


To prune trees that flower on the previous year's growth and maximize flowering, you should
A. prune anything during the dormant season
B. prune shortly after flowering
C. prune in late summer after seed formation
D. prune in the fall, just after leaf drop


When soils are compacted by construction equipment, trees usually decline because
A. oxygen availability is reduced
B. the ability of the roots to absorb water and minerals decreases
C. root growth and expansion may be diminished
D. all of the above


What macronutrient is most typically requried by the tree in large quantities releative to other macronutrients?
A. Sulfur
B. Calcium
C. Potassium
D. Nitrogen
When two leaves and/or buds are located at the same node on a twig, the arrangement is called
A. opposite
B. alternate
C. whorled
D. compound

 

If a planting hole in a clay soil site is backfilled with sandy soil
A. drainage will be improved helping the tree to establish
B. nutrients will be more available to the newly established roots within the planting hole
C. water will drain very slowly out of the planting hole
D. the improved texture of the backfill will reduce the chances of girdling roots forming later

 

Placing gravel in the bottom of the planting hole in a clay soil site
A. will improve drainage
B. will prevent the formation of girdling roots
C. will restrict soil space and create a perched water situation
D. will improve aeration and water infiltration

 

When planting a container-grown tree
A. a few vertical slices through the root mass may reduce girdling roots
B. place soft fill in the bottom of the planting hole to encourage tap root growth
C. backfill the hole with a soil-less growth medium to encourage growth
D. none of the above

 

Staking or guying when planting a tree
A. Is only done for bare root trees
B. Is not necessary for trees greater than 6 inch diameter
C. Is no always required or necessary
D. Promotes a larger and stronger root system and better trunk taper


When pruning a branch from a tree, the final cut should be
A. flush with the parent stem
B. at a 45 degree angle with the parent stem
C. parallel to the branch bark ridge
D. just outside the branch collar


Identify the leaves from this common Piedmont Tree
A. Sweetgum
B. Red Oak
C. White Oak
D. Post Oak

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