ISA Arborist Study Guide Sample
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Bark, phloem, cambium, xylem - CORRECT ANSWER - When cutting through a tree
with a chain saw or drilling into a tree, you would pass through (in order)
Growth may be stimulated in lateral buds - CORRECT ANSWER - If the terminal bud is
removed in pruning:
The growth rings of a tree: - CORRECT ANSWER - Visible because of the rapid growth
rate of earlywood relative to latewood, can be counted on to approximate trees age, can give
information about growth conditions in previous years.
Cambium - CORRECT ANSWER - layer of cells is responsible for outward growth and
increased girth of tree.
Mycorrhizae are: - CORRECT ANSWER - A symbiotic relationship between fungi and
roots.
Douglas-fir (Pseudotsuga menziesii) differs from balsam fir (Abies balsamea) in that: -
CORRECT ANSWER - They are not in the same genus.
Opposite leaf arrangement is: - CORRECT ANSWER - When two leaves and/or buds are
located at the same node on a twig.
Quercus rubra - CORRECT ANSWER - Scientific name of Red Oak.
Quercus (Oak) - CORRECT ANSWER - This genus of tree usually does not have an
opposite leaf arrangement.
, Pines - CORRECT ANSWER - These conifers have needles in bundles.
Available oxygen and water - CORRECT ANSWER - The primary factor in controlling
the depth, spread, and distribution of tree roots in the soil is/are:
The most fibrous and absorptive portion of a tree's root system is found in? - CORRECT
ANSWER - Are in the upper 6 inches of soil.
Water will drain very slowly out of the planting hole. - CORRECT ANSWER - If a
planting hole in a clay soil site is backfilled with sandy soil.
When soil is compacted: - CORRECT ANSWER - Total pore space and the percentage of
macropores are reduced.
A characteristic of sandy soils in arid regions is: - CORRECT ANSWER - They tend to
become alkaline, and salts build up due to the lack of heavy rainfall.
When irrigating trees: - CORRECT ANSWER - Infrequent, deep soakings are preferable
to frequent, shallow waterings.
Sandy soils: - CORRECT ANSWER - Have a higher infiltration rate than clay soils.
A soil is at field capacity when: - CORRECT ANSWER - Gravitational water has drained
away.
With sprinkler irrigation: - CORRECT ANSWER - 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.
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Bark, phloem, cambium, xylem - CORRECT ANSWER - When cutting through a tree
with a chain saw or drilling into a tree, you would pass through (in order)
Growth may be stimulated in lateral buds - CORRECT ANSWER - If the terminal bud is
removed in pruning:
The growth rings of a tree: - CORRECT ANSWER - Visible because of the rapid growth
rate of earlywood relative to latewood, can be counted on to approximate trees age, can give
information about growth conditions in previous years.
Cambium - CORRECT ANSWER - layer of cells is responsible for outward growth and
increased girth of tree.
Mycorrhizae are: - CORRECT ANSWER - A symbiotic relationship between fungi and
roots.
Douglas-fir (Pseudotsuga menziesii) differs from balsam fir (Abies balsamea) in that: -
CORRECT ANSWER - They are not in the same genus.
Opposite leaf arrangement is: - CORRECT ANSWER - When two leaves and/or buds are
located at the same node on a twig.
Quercus rubra - CORRECT ANSWER - Scientific name of Red Oak.
Quercus (Oak) - CORRECT ANSWER - This genus of tree usually does not have an
opposite leaf arrangement.
, Pines - CORRECT ANSWER - These conifers have needles in bundles.
Available oxygen and water - CORRECT ANSWER - The primary factor in controlling
the depth, spread, and distribution of tree roots in the soil is/are:
The most fibrous and absorptive portion of a tree's root system is found in? - CORRECT
ANSWER - Are in the upper 6 inches of soil.
Water will drain very slowly out of the planting hole. - CORRECT ANSWER - If a
planting hole in a clay soil site is backfilled with sandy soil.
When soil is compacted: - CORRECT ANSWER - Total pore space and the percentage of
macropores are reduced.
A characteristic of sandy soils in arid regions is: - CORRECT ANSWER - They tend to
become alkaline, and salts build up due to the lack of heavy rainfall.
When irrigating trees: - CORRECT ANSWER - Infrequent, deep soakings are preferable
to frequent, shallow waterings.
Sandy soils: - CORRECT ANSWER - Have a higher infiltration rate than clay soils.
A soil is at field capacity when: - CORRECT ANSWER - Gravitational water has drained
away.
With sprinkler irrigation: - CORRECT ANSWER - 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.
