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PS 103 ...,,.. questions and answers already solved 2024
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PS 103 ...,,.. questions and answers already solved 2024
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PS 103: Chapter 15It is natural for weeds to fill empty niches in cropping systems. - correct
answer ✔True
Weeds can be classified by the environments in which they grow. - correct
answer ✔True
Crop plants are never weeds. - correct answer ✔False
Biennial weeds flower in the first year. - correct answer ✔False
Most dicots are easier to kill by cultivation than monocots. - correct answer
✔True
A weed must be alive in order to demonstrate allelopathic properties. - correct
answer ✔False
Over 95 percent of the corn, soybean, and cotton crops grown are treated with
herbicides. - correct answer ✔True
Weeds can interfere with harvesting equipment. - correct answer ✔True
Weed seed tends to be bigger than crop seed. - correct answer ✔False
Animals do not have a significant role in weed dispersal. - correct answer
✔False
, Insecticides are used more than any other pesticide. - correct answer
✔False
It is a violation of federal law to use a herbicide in a manner inconsistent with
its labeling. - correct answer ✔True
Selective herbicides affect almost all plants. - correct answer ✔False
Different crop species select for different weed species. - correct answer
✔True
A disadvantage of biological control is the possibility of affecting non-target
species. - correct answer ✔False
Tillage is an effective strategy of weed control regardless of weed species. -
correct answer ✔False
The main concern with atrazine is leaching and accumulation in surface and
groundwater. - correct answer ✔True
A plant can be classified as a weed if it:
A. Causes economic loss to a crop.
B. Is harmful to humans and livestock
C. Is detrimental to wildlife or ecosystems
D. All answers are correct - correct answer ✔D
Weeds that are especially injurious are classified by the government as:
A. Toxic
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