California Qualified Applicator Certificate –
Category F: Aquatic Pest Control (QAC)
Practice Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which of the following is considered a primary goal of aquatic pest
management?
A. Increase recreational use of water bodies
B. Protect water quality and native species
C. Promote fish stocking
D. Encourage aquatic plant growth
Rationale: The primary goal of aquatic pest management is to
protect water quality, control pest populations, and preserve native
species.
2. Which aquatic weed reproduces primarily via turions and rhizomes?
A. Water hyacinth
, B. Eurasian watermilfoil
C. Cattail
D. Duckweed
Rationale: Eurasian watermilfoil spreads primarily through
vegetative means such as turions and rhizomes, allowing rapid
colonization.
3. Which of the following is a non-chemical control method for algae?
A. Copper sulfate
B. Aeration and shading
C. Herbicide application
D. Surfactant treatment
Rationale: Aeration increases oxygen and water circulation, while
shading reduces light penetration, both limiting algae growth
without chemicals.
4. The first step in an Integrated Pest Management (IPM) program is:
A. Apply pesticides
B. Identify and monitor pests
C. Implement mechanical control
D. Evaluate control methods
Rationale: IPM begins with correctly identifying pests and monitoring
their populations to determine the need for control.
5. Which aquatic pest is an invasive floating plant that can double its
biomass in two weeks?
, A. Cattail
B. Water hyacinth
C. Eurasian watermilfoil
D. Hydrilla
Rationale: Water hyacinth is highly invasive and fast-growing,
forming dense mats that impede water use and oxygen levels.
6. What is the primary effect of excessive algae growth in ponds?
A. Reduce water temperature
B. Deplete dissolved oxygen at night
C. Increase fish populations
D. Reduce nutrient levels
Rationale: Algae consume oxygen during nighttime respiration,
potentially causing fish kills due to hypoxia.
7. Which method is effective for controlling floating aquatic weeds?
A. Rooting barrier
B. Mechanical harvesting
C. Subsurface irrigation
D. Trapping
Rationale: Mechanical harvesting removes floating weeds like water
hyacinth from the water surface.
8. What is the primary route of herbicide uptake for submerged aquatic
plants?
A. Through flowers
, B. Through leaves and stems
C. Through roots only
D. Through sediment absorption
Rationale: Submerged aquatic plants primarily absorb systemic
herbicides through their leaves and stems rather than roots.
9. Which of the following is classified as an aquatic herbicide?
A. Chlorpyrifos
B. Diquat
C. Bacillus thuringiensis
D. Malathion
Rationale: Diquat is a contact herbicide commonly used for aquatic
weed control.
10. Which pest control method can reduce non-target impacts in
aquatic environments?
A. Broad-spectrum herbicide
B. Spot treatment
C. Entire-lake chemical application
D. High-dose broadcast spraying
Rationale: Spot treatment targets only affected areas, minimizing
harm to non-target species and water quality.
11. What is the main environmental concern associated with
copper-based algaecides?
A. Increase pH levels
Category F: Aquatic Pest Control (QAC)
Practice Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which of the following is considered a primary goal of aquatic pest
management?
A. Increase recreational use of water bodies
B. Protect water quality and native species
C. Promote fish stocking
D. Encourage aquatic plant growth
Rationale: The primary goal of aquatic pest management is to
protect water quality, control pest populations, and preserve native
species.
2. Which aquatic weed reproduces primarily via turions and rhizomes?
A. Water hyacinth
, B. Eurasian watermilfoil
C. Cattail
D. Duckweed
Rationale: Eurasian watermilfoil spreads primarily through
vegetative means such as turions and rhizomes, allowing rapid
colonization.
3. Which of the following is a non-chemical control method for algae?
A. Copper sulfate
B. Aeration and shading
C. Herbicide application
D. Surfactant treatment
Rationale: Aeration increases oxygen and water circulation, while
shading reduces light penetration, both limiting algae growth
without chemicals.
4. The first step in an Integrated Pest Management (IPM) program is:
A. Apply pesticides
B. Identify and monitor pests
C. Implement mechanical control
D. Evaluate control methods
Rationale: IPM begins with correctly identifying pests and monitoring
their populations to determine the need for control.
5. Which aquatic pest is an invasive floating plant that can double its
biomass in two weeks?
, A. Cattail
B. Water hyacinth
C. Eurasian watermilfoil
D. Hydrilla
Rationale: Water hyacinth is highly invasive and fast-growing,
forming dense mats that impede water use and oxygen levels.
6. What is the primary effect of excessive algae growth in ponds?
A. Reduce water temperature
B. Deplete dissolved oxygen at night
C. Increase fish populations
D. Reduce nutrient levels
Rationale: Algae consume oxygen during nighttime respiration,
potentially causing fish kills due to hypoxia.
7. Which method is effective for controlling floating aquatic weeds?
A. Rooting barrier
B. Mechanical harvesting
C. Subsurface irrigation
D. Trapping
Rationale: Mechanical harvesting removes floating weeds like water
hyacinth from the water surface.
8. What is the primary route of herbicide uptake for submerged aquatic
plants?
A. Through flowers
, B. Through leaves and stems
C. Through roots only
D. Through sediment absorption
Rationale: Submerged aquatic plants primarily absorb systemic
herbicides through their leaves and stems rather than roots.
9. Which of the following is classified as an aquatic herbicide?
A. Chlorpyrifos
B. Diquat
C. Bacillus thuringiensis
D. Malathion
Rationale: Diquat is a contact herbicide commonly used for aquatic
weed control.
10. Which pest control method can reduce non-target impacts in
aquatic environments?
A. Broad-spectrum herbicide
B. Spot treatment
C. Entire-lake chemical application
D. High-dose broadcast spraying
Rationale: Spot treatment targets only affected areas, minimizing
harm to non-target species and water quality.
11. What is the main environmental concern associated with
copper-based algaecides?
A. Increase pH levels
