ISA Arborist Exam Questions

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Certified Arborist Exam Questions

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Q:1-When pruning young trees it is recommended that one half the foliage remain in the lower 2/3 of the crown to
Mark one answer:

help develop trunk taper and wind stability
encourage growth of a central leader
reduce height growth
limit transpiration in the portion of the tree furthest from the roots



Q:2-A complete fertilizer contains
Mark one answer:

nitrogen, phosphorus and potassium
equal amounts of N, P & K
all 16 essential elements
organic and inorganic nitrogen


Q:3-When two leaves and/or buds are located at the same node on a twig, the arrangement is called
Mark one answer:

opposite
alternate
whorled
compound


Q:4-Which genus of trees usually has clustered terminal buds?
Mark one answer:

Cornus (dogwoods)
Acer (maples)
Quercus (oaks)
Fagus (beech)


Q:5-When planting a container-grown tree
Mark one answer:

a few vertical slices through the root mass may reduce girdling roots
none of these answers are correct
backfill the hole with a soilless growth medium to encourage root growth
place soft fill in the bottom of the planting hole to encourage tap root growth



Q:6-Sulfer-coated urea or urea formaldehyde is sometimes included in nitrogen fertilizers because
Mark one answer:

the soil's buffering capacity may inhibit nitrogen absorption
the soil pH must be adjusted to optimize nutrient uptake
controlled release forms of nitrogen are sometimes desired
urea is a good, natural source of phosphorus


Q:7-The purpose of a lightning protection system is to
Mark one answer:

conduct the electrical charge into the soil away from the tree
reduce the voltage of the strike
prevent the tree from being struck
all of these answers are correct


Q:8-Select the scientific name that is written correctly
Mark one answer:

quercus rubra
Quercus rubra
quercus Rubra
Quercus Rubra


Q:9-A characteristic of sandy soils in arid regions is
Mark one answer:

they are fine in texture due to the high sand content
they tend to become alkaline, and salts build up due to the lack of heavy rainfall
they tend to become acid since basic ions leach out
they have a high water-holding capacity since rainfall is scarce


Q:10-A prusik loop is used
Mark one answer:

to cable small, multi-stemmed trees
when speed-lining limbs over objects below
to "tie in" with the secured footlock method
as a false crotch to lower limbs



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