ISA ARBORIST COMPREHENSIVE TEST 191 2026
QUESTIONS WITH ANSWERS GRADED A+
◉ Biorational Control Product. Answer: 2) Control product or
pesticide that has limited environmental persistence and poses very
low risk to nontarget organisms.
◉ Bipinnate. Answer: Double pinnate. Contrast with palmate and
pinnate.
◉ Biotic Disorder. Answer: Disorder caused by an infectious living
agent.
◉ Blake's Hitch. Answer: Friction know climbers use, sometimes in
place of the tautline hitch or Prusik knot.
◉ Blight. Answer: Any disease or disorder, regardless of the causal
agent, that kills young plant tissues.
◉ Block. Answer: 1) Heavy-duty pulley used in rigging. Designed for
dynamic loading.
◉ Block. Answer: 2) Casing enclosing one or more parallel pulleys.
,◉ Body-Thrust. Answer: Method of ascending a tree using a climbing
rope.
◉ Bollard. Answer: Post on which wraps can be taken with a rope to
tie it off or to provide friction for control.
◉ Botanical Pesticide. Answer: Pesticides derived from plants.
◉ Box Cable System. Answer: Tree cabling system that forms closed
polygons. Used to join together more than three stems.
◉ Bracket. Answer: British English term for the fruiting body of a
decay fungus.
◉ Branch Bark Ridge. Answer: Raised strip of bark at the top of a
branch union, where the growth and expansion of the trunk or
parent stem and adjoining branch push the bark in a ridge.
◉ Branch Collar. Answer: Area where a branch joins another branch
or trunk that is created by the overlapping vascular tissues from
both the branch and the trunk. Typically enlarged at the base of the
branch.
,◉ Branch Protection Zone. Answer: Chemically and physically
modified tissue within the trunk or parent branch at the base of a
smaller, subordinate branch that retards the spread of discoloration
and decay from the subordinate stem into the trunk or parent.
◉ Brown Rot. Answer: Fungal wood rot characterized by the
breakdown of cellulose. Contrast with soft rot and white rot.
◉ Bud. Answer: 1) Smaller lateral or terminal protuberance on the
stem of a plant that may develop into a flower or shoot.
◉ Bud. Answer: 2) Undeveloped flower or shoot containing a
meristematic growing point.
◉ Buffering Capacity. Answer: Ability of a soil to maintain its pH.
◉ Bulk Density. Answer: Mass of soil per unit volume. Often used as
a measure of compaction.
◉ Butt-hitching. Answer: Method of lowering pieces when the
rigging point is below the work, traditionally without the use of a
block.
◉ Butt-tying. Answer: Tying off a limb at the butt end for rigging.
, ◉ Buttress Roots. Answer: Roots at the trunk base that help support
the tree and equalize mechanical stress.
◉ Cable Aid. Answer: Device used to tighten lags and aid in cable
installation.
◉ Cable Clamp. Answer: Doubled-bolted, U-shaped clamp,
sometimes used to secure tree cables. Not acceptable or approved
for tree support systems in the U.S.
◉ Cable Grip. Answer: Mechanical device that grasps and holds the
cable during installation.
◉ Cable Stop. Answer: Metal knob that can be affixed to the ends of
steel cable strands to terminate a cable installation.
◉ Cambium. Answer: Thin layers of meristematic cells that give rise
(outward) to the phloem and (inward) to the xylem, increasing stem
and root diameter.
◉ Canadian Standards Association (CSA). Answer: Canadian not-for-
profit association made up of representatives from various industry,
association, and governmental groups providing standards
QUESTIONS WITH ANSWERS GRADED A+
◉ Biorational Control Product. Answer: 2) Control product or
pesticide that has limited environmental persistence and poses very
low risk to nontarget organisms.
◉ Bipinnate. Answer: Double pinnate. Contrast with palmate and
pinnate.
◉ Biotic Disorder. Answer: Disorder caused by an infectious living
agent.
◉ Blake's Hitch. Answer: Friction know climbers use, sometimes in
place of the tautline hitch or Prusik knot.
◉ Blight. Answer: Any disease or disorder, regardless of the causal
agent, that kills young plant tissues.
◉ Block. Answer: 1) Heavy-duty pulley used in rigging. Designed for
dynamic loading.
◉ Block. Answer: 2) Casing enclosing one or more parallel pulleys.
,◉ Body-Thrust. Answer: Method of ascending a tree using a climbing
rope.
◉ Bollard. Answer: Post on which wraps can be taken with a rope to
tie it off or to provide friction for control.
◉ Botanical Pesticide. Answer: Pesticides derived from plants.
◉ Box Cable System. Answer: Tree cabling system that forms closed
polygons. Used to join together more than three stems.
◉ Bracket. Answer: British English term for the fruiting body of a
decay fungus.
◉ Branch Bark Ridge. Answer: Raised strip of bark at the top of a
branch union, where the growth and expansion of the trunk or
parent stem and adjoining branch push the bark in a ridge.
◉ Branch Collar. Answer: Area where a branch joins another branch
or trunk that is created by the overlapping vascular tissues from
both the branch and the trunk. Typically enlarged at the base of the
branch.
,◉ Branch Protection Zone. Answer: Chemically and physically
modified tissue within the trunk or parent branch at the base of a
smaller, subordinate branch that retards the spread of discoloration
and decay from the subordinate stem into the trunk or parent.
◉ Brown Rot. Answer: Fungal wood rot characterized by the
breakdown of cellulose. Contrast with soft rot and white rot.
◉ Bud. Answer: 1) Smaller lateral or terminal protuberance on the
stem of a plant that may develop into a flower or shoot.
◉ Bud. Answer: 2) Undeveloped flower or shoot containing a
meristematic growing point.
◉ Buffering Capacity. Answer: Ability of a soil to maintain its pH.
◉ Bulk Density. Answer: Mass of soil per unit volume. Often used as
a measure of compaction.
◉ Butt-hitching. Answer: Method of lowering pieces when the
rigging point is below the work, traditionally without the use of a
block.
◉ Butt-tying. Answer: Tying off a limb at the butt end for rigging.
, ◉ Buttress Roots. Answer: Roots at the trunk base that help support
the tree and equalize mechanical stress.
◉ Cable Aid. Answer: Device used to tighten lags and aid in cable
installation.
◉ Cable Clamp. Answer: Doubled-bolted, U-shaped clamp,
sometimes used to secure tree cables. Not acceptable or approved
for tree support systems in the U.S.
◉ Cable Grip. Answer: Mechanical device that grasps and holds the
cable during installation.
◉ Cable Stop. Answer: Metal knob that can be affixed to the ends of
steel cable strands to terminate a cable installation.
◉ Cambium. Answer: Thin layers of meristematic cells that give rise
(outward) to the phloem and (inward) to the xylem, increasing stem
and root diameter.
◉ Canadian Standards Association (CSA). Answer: Canadian not-for-
profit association made up of representatives from various industry,
association, and governmental groups providing standards
