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MDARD COMMERCIAL PESTICIDE APPLICATOR EXAM: AQUATIC
PEST MANAGEMENT (CATEGORY 5) EXAM LATEST 2025/2026
ACTUAL EXAM WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (100% VERIFIED ANSWERS) |ALREADY
GRADED A+| ||PROFESSOR VERIFIED|| ||BRANDNEW!!!||
Why are there so few aquatic herbicides? - ANSWER-The aquatic
environment limits the number of compounds effective for
controlling pests and meet the rigid requirements necessary for
registration.
Ways herbicides are classified (3) - ANSWER-1. Absorption
characteristics
2. The plant processes that they affect
3. Selectivity
Contact herbicides are generally most effective on __________
_________ plants - ANSWER-annual herbaceous
Plant processes affected by herbicidal activity (5) - ANSWER-1.
Cell division
2. Tissue development
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3. Photosynthesis
4. Respiration
5. Nitrogen Metabolism and Enzyme Activity
At what growing stage are herbicides that affect cell division most
effective? - ANSWER-Preemergence
Plant growth regulators (PGRs) affect what process of plants? -
ANSWER-Tissue development
Plant death may be ______ when the photosynthesis process is
disrupted. - ANSWER-Slow
Physical factors that contribute to susceptibility to selective
herbicides (3) - ANSWER-1. Herbicide placement
2. Formulation
3. Rate of applicaiton
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Biological factors that contribute to susceptibility to selective
herbicides (3) - ANSWER-1. Physiological factors
2. Morphological factors
3. Stage of plant growth
At what point in the growth cycle are foliar-active herbicides the
most effective for perennial plants? - ANSWER-Late and
postflowering periods (when perennial plants are translocating
materials downwards towards the roots)
Low temperature affects herbicide efficiency by - ANSWER-
slowing growth, and therefor slowing absorption
Methods used when managing aquatic weeds in flowing water (4)
- ANSWER-1. Trailing hoses to aid the sinking of herbicides
2. Special herbicide formulations, such as slow-release pellets
3. Rapidly absorbed herbicides
4. Increased contact time via sequential applications or injection
equipment
, 4|Page
Particles suspended in the water affect the water's ability to
transmit light. This is known as what quality of the water? -
ANSWER-Turbidity
Aquatic pesticides are known to last a long time and accumulate
in organisms. True or False? - ANSWER-False
What is the most common reason for herbicide-related fish kills? -
ANSWER-Lowering of dissolved oxygen
How can the lowering of dissolved oxygen be limited? -
ANSWER-By limiting the amount of vegetation killed off
The danger of fish kills is less in ______ water because it can
hold more oxygen than _____ water - ANSWER-cooler, warm
Do not treat more than ______-_______% of the surface area of
a body of water at any given time - ANSWER-30,50
MDARD COMMERCIAL PESTICIDE APPLICATOR EXAM: AQUATIC
PEST MANAGEMENT (CATEGORY 5) EXAM LATEST 2025/2026
ACTUAL EXAM WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (100% VERIFIED ANSWERS) |ALREADY
GRADED A+| ||PROFESSOR VERIFIED|| ||BRANDNEW!!!||
Why are there so few aquatic herbicides? - ANSWER-The aquatic
environment limits the number of compounds effective for
controlling pests and meet the rigid requirements necessary for
registration.
Ways herbicides are classified (3) - ANSWER-1. Absorption
characteristics
2. The plant processes that they affect
3. Selectivity
Contact herbicides are generally most effective on __________
_________ plants - ANSWER-annual herbaceous
Plant processes affected by herbicidal activity (5) - ANSWER-1.
Cell division
2. Tissue development
,2|Page
3. Photosynthesis
4. Respiration
5. Nitrogen Metabolism and Enzyme Activity
At what growing stage are herbicides that affect cell division most
effective? - ANSWER-Preemergence
Plant growth regulators (PGRs) affect what process of plants? -
ANSWER-Tissue development
Plant death may be ______ when the photosynthesis process is
disrupted. - ANSWER-Slow
Physical factors that contribute to susceptibility to selective
herbicides (3) - ANSWER-1. Herbicide placement
2. Formulation
3. Rate of applicaiton
,3|Page
Biological factors that contribute to susceptibility to selective
herbicides (3) - ANSWER-1. Physiological factors
2. Morphological factors
3. Stage of plant growth
At what point in the growth cycle are foliar-active herbicides the
most effective for perennial plants? - ANSWER-Late and
postflowering periods (when perennial plants are translocating
materials downwards towards the roots)
Low temperature affects herbicide efficiency by - ANSWER-
slowing growth, and therefor slowing absorption
Methods used when managing aquatic weeds in flowing water (4)
- ANSWER-1. Trailing hoses to aid the sinking of herbicides
2. Special herbicide formulations, such as slow-release pellets
3. Rapidly absorbed herbicides
4. Increased contact time via sequential applications or injection
equipment
, 4|Page
Particles suspended in the water affect the water's ability to
transmit light. This is known as what quality of the water? -
ANSWER-Turbidity
Aquatic pesticides are known to last a long time and accumulate
in organisms. True or False? - ANSWER-False
What is the most common reason for herbicide-related fish kills? -
ANSWER-Lowering of dissolved oxygen
How can the lowering of dissolved oxygen be limited? -
ANSWER-By limiting the amount of vegetation killed off
The danger of fish kills is less in ______ water because it can
hold more oxygen than _____ water - ANSWER-cooler, warm
Do not treat more than ______-_______% of the surface area of
a body of water at any given time - ANSWER-30,50
