Chapter 4 Key Terms
Comprehensive Questions
(Frequently Tested) and Complete
Solutions Graded A+
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action threshold - Answer: A point at which the level of
incompatible plant species, density, height, location or condition
threatens the stated management objectives and requires
implementation of control methods.
, Accute Toxicity - Answer: adverse effects resulting from exposure
to a single dose or exposure to multiple doses of a substance over
a short time frame (usually less than 24 hours).
Alleopathy - Answer: ability of some plants, including certain
grasses, to release chemicals that suppress other plants species
growing around them.
basal application - Answer: herbicide application made at the
bottom 12 inches (30 cm) of the stem and root collar with an
herbicide in an oil carrier.
border zone - Answer: Section of a transmission or pipeline, right
of way that extends from the wire or pipe zone to the right of way
edge. The border zone is managed to promote a low growing
plant community of forbs, tall shrubs, and low growing trees
below a specified height.
chronic toxicity - Answer: damage to an organ system by a
substance through disruption of biochemical pathways or
enzymes in areas other than the point of contact. The delayed
damage resulting from the repeated exposure to low amounts of
a substance, evolving over a long period of time or a lifetime.