ISA Arborist Study Guide
Enhanced Exam With
Rellable Questions and
Answers 2025/2026
Bark, phloem, cambium, xylem - Correct Answers-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 Answers-If the terminal
bud is removed in pruning:
The growth rings of a tree: - Correct Answers-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 Answers-layer of cells is responsible for outward growth
and increased girth of tree.
Mycorrhizae are: - Correct Answers-A symbiotic relationship between fungi
and roots.
Douglas-fir (Pseudotsuga menziesii) differs from balsam fir (Abies balsamea)
in that: - Correct Answers-They are not in the same genus.
Opposite leaf arrangement is: - Correct Answers-When two leaves and/or
buds are located at the same node on a twig.
Quercus rubra - Correct Answers-Scientific name of Red Oak.
Quercus (Oak) - Correct Answers-This genus of tree usually does not have an
opposite leaf arrangement.
Pines - Correct Answers-These conifers have needles in bundles.
Available oxygen and water - Correct Answers-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 Answers-Are in the upper 6 inches of soil.
Water will drain very slowly out of the planting hole. - Correct Answers-If a
planting hole in a clay soil site is backfilled with sandy soil.
When soil is compacted: - Correct Answers-Total pore space and the
percentage of macropores are reduced.
A characteristic of sandy soils in arid regions is: - Correct Answers-They tend
to become alkaline, and salts build up due to the lack of heavy rainfall.
When irrigating trees: - Correct Answers-Infrequent, deep soakings are
preferable to frequent, shallow waterings.
Sandy soils: - Correct Answers-Have a higher infiltration rate than clay soils.
A soil is at field capacity when: - Correct Answers-Gravitational water has
drained away.
With sprinkler irrigation: - Correct Answers-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.
In sites where poor drainage can be a problem, which of the following WILL
NOT help ensure plant survival? - Correct Answers-Placing gravel in the
bottom of the planting hole and backfilling with a sandy soil.
8 pounds of nitrogen - Correct Answers-80 pound bag of 10-6-4 fertilizer
contains how many pounds of actual nitrogen?
Nitrogen, phosphorus, potassium - Correct Answers-A complete fertilizer
contains?
A tree may not respond immediately to a fertilizer application if: - Correct
Answers-A slow release fertilizer was applied, inadequate soil moisture, and
a tree is suffering from collar rot
A soil test may not identify a nutrient deficiency problem in a plant because:
- Correct Answers-The soil may have adequate nutrients but something may
be inhibiting uptake.
Sulfur-coated urea/ or ureaformaldehyde is sometimes included in nitrogen
fertilizers because: - Correct Answers-Slow-release forms of nitrogen are
sometimes desired.
Enhanced Exam With
Rellable Questions and
Answers 2025/2026
Bark, phloem, cambium, xylem - Correct Answers-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 Answers-If the terminal
bud is removed in pruning:
The growth rings of a tree: - Correct Answers-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 Answers-layer of cells is responsible for outward growth
and increased girth of tree.
Mycorrhizae are: - Correct Answers-A symbiotic relationship between fungi
and roots.
Douglas-fir (Pseudotsuga menziesii) differs from balsam fir (Abies balsamea)
in that: - Correct Answers-They are not in the same genus.
Opposite leaf arrangement is: - Correct Answers-When two leaves and/or
buds are located at the same node on a twig.
Quercus rubra - Correct Answers-Scientific name of Red Oak.
Quercus (Oak) - Correct Answers-This genus of tree usually does not have an
opposite leaf arrangement.
Pines - Correct Answers-These conifers have needles in bundles.
Available oxygen and water - Correct Answers-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 Answers-Are in the upper 6 inches of soil.
Water will drain very slowly out of the planting hole. - Correct Answers-If a
planting hole in a clay soil site is backfilled with sandy soil.
When soil is compacted: - Correct Answers-Total pore space and the
percentage of macropores are reduced.
A characteristic of sandy soils in arid regions is: - Correct Answers-They tend
to become alkaline, and salts build up due to the lack of heavy rainfall.
When irrigating trees: - Correct Answers-Infrequent, deep soakings are
preferable to frequent, shallow waterings.
Sandy soils: - Correct Answers-Have a higher infiltration rate than clay soils.
A soil is at field capacity when: - Correct Answers-Gravitational water has
drained away.
With sprinkler irrigation: - Correct Answers-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.
In sites where poor drainage can be a problem, which of the following WILL
NOT help ensure plant survival? - Correct Answers-Placing gravel in the
bottom of the planting hole and backfilling with a sandy soil.
8 pounds of nitrogen - Correct Answers-80 pound bag of 10-6-4 fertilizer
contains how many pounds of actual nitrogen?
Nitrogen, phosphorus, potassium - Correct Answers-A complete fertilizer
contains?
A tree may not respond immediately to a fertilizer application if: - Correct
Answers-A slow release fertilizer was applied, inadequate soil moisture, and
a tree is suffering from collar rot
A soil test may not identify a nutrient deficiency problem in a plant because:
- Correct Answers-The soil may have adequate nutrients but something may
be inhibiting uptake.
Sulfur-coated urea/ or ureaformaldehyde is sometimes included in nitrogen
fertilizers because: - Correct Answers-Slow-release forms of nitrogen are
sometimes desired.
