1. What is the primary concern when applying pesticides to aquatic
environments?
A. Cost of chemicals
B. Impact on non-target organisms
C. Color of water
D. Speed of application
ANSWER : B
Explanation: Aquatic pesticides can affect fish, invertebrates, and plants not
intended for control.
2. Which water body is most sensitive to pesticide contamination?
A. Swimming pool
B. Irrigation canal
C. Drinking water reservoir
D. Flooded field
ANSWER : C
Explanation: Drinking water sources must be protected to prevent human
exposure.
3. Which agency regulates aquatic pesticide use in California?
A. EPA only
B. FDA
C. DPR and EPA
D. OSHA
ANSWER : C
Explanation: California DPR enforces pesticide laws in coordination with the
U.S. EPA.
,4. Which pest is commonly targeted in aquatic weed control?
A. Termites
B. Water hyacinth
C. Aphids
D. Cockroaches
ANSWER : B
Explanation: Water hyacinth is a major invasive aquatic plant.
5. What happens if dissolved oxygen drops too quickly after treatment?
A. Increased algae growth
B. Fish kill
C. Improved water quality
D. No effect
ANSWER : B
Explanation: Rapid plant decay consumes oxygen, suffocating fish.
6. Aquatic herbicides should be applied when:
A. Water is frozen
B. Plants are actively growing
C. Wind speed is high
D. Rain is expected
ANSWER : B
Explanation: Active growth allows better herbicide absorption.
7. Which formulation is commonly used in aquatic applications?
A. Dust
B. Granular
C. Fog
D. Smoke
ANSWER : B
Explanation: Granular formulations sink and target submerged weeds.
,8. Why is partial treatment recommended in dense weed infestations?
A. Reduce cost
B. Improve aesthetics
C. Prevent oxygen depletion
D. Increase speed
ANSWER : C
Explanation: Treating sections avoids massive oxygen loss from decomposing
plants.
9. What is a major risk of copper-based algaecides?
A. Increased algae resistance
B. Fish toxicity
C. Reduced clarity
D. Rapid evaporation
ANSWER : B
Explanation: Copper can be toxic to fish, especially in soft water.
10. Which label statement is most important for aquatic use?
A. Storage temperature
B. Aquatic use approved
C. Shelf life
D. Container size
ANSWER : B
Explanation: Only products labeled for aquatic use are legal to apply.
11. What does “half-life” refer to in aquatic pesticides?
A. Time to mix
B. Time to evaporate
C. Time for 50% breakdown
D. Time before reapplication
ANSWER : C
Explanation: Half-life measures how long the pesticide remains active.
, 12. Which aquatic pest is an insect?
A. Duckweed
B. Hydrilla
C. Mosquito larvae
D. Algae
ANSWER : C
Explanation: Mosquito larvae are aquatic insects commonly controlled.
13. What is biomagnification?
A. Dilution of pesticides
B. Accumulation in food chains
C. Rapid degradation
D. Water evaporation
ANSWER : B
Explanation: Pesticides can increase in concentration up the food chain.
14. Which method reduces pesticide drift into water?
A. Aerial spraying
B. High pressure spraying
C. Spot treatment
D. Windy application
ANSWER : C
Explanation: Spot treatments limit pesticide movement.
15. What must be done before treating public waterways?
A. Notify fish
B. Obtain permits
C. Drain water
D. Increase dosage
ANSWER : B
Explanation: Permits are required for public and regulated waters.
environments?
A. Cost of chemicals
B. Impact on non-target organisms
C. Color of water
D. Speed of application
ANSWER : B
Explanation: Aquatic pesticides can affect fish, invertebrates, and plants not
intended for control.
2. Which water body is most sensitive to pesticide contamination?
A. Swimming pool
B. Irrigation canal
C. Drinking water reservoir
D. Flooded field
ANSWER : C
Explanation: Drinking water sources must be protected to prevent human
exposure.
3. Which agency regulates aquatic pesticide use in California?
A. EPA only
B. FDA
C. DPR and EPA
D. OSHA
ANSWER : C
Explanation: California DPR enforces pesticide laws in coordination with the
U.S. EPA.
,4. Which pest is commonly targeted in aquatic weed control?
A. Termites
B. Water hyacinth
C. Aphids
D. Cockroaches
ANSWER : B
Explanation: Water hyacinth is a major invasive aquatic plant.
5. What happens if dissolved oxygen drops too quickly after treatment?
A. Increased algae growth
B. Fish kill
C. Improved water quality
D. No effect
ANSWER : B
Explanation: Rapid plant decay consumes oxygen, suffocating fish.
6. Aquatic herbicides should be applied when:
A. Water is frozen
B. Plants are actively growing
C. Wind speed is high
D. Rain is expected
ANSWER : B
Explanation: Active growth allows better herbicide absorption.
7. Which formulation is commonly used in aquatic applications?
A. Dust
B. Granular
C. Fog
D. Smoke
ANSWER : B
Explanation: Granular formulations sink and target submerged weeds.
,8. Why is partial treatment recommended in dense weed infestations?
A. Reduce cost
B. Improve aesthetics
C. Prevent oxygen depletion
D. Increase speed
ANSWER : C
Explanation: Treating sections avoids massive oxygen loss from decomposing
plants.
9. What is a major risk of copper-based algaecides?
A. Increased algae resistance
B. Fish toxicity
C. Reduced clarity
D. Rapid evaporation
ANSWER : B
Explanation: Copper can be toxic to fish, especially in soft water.
10. Which label statement is most important for aquatic use?
A. Storage temperature
B. Aquatic use approved
C. Shelf life
D. Container size
ANSWER : B
Explanation: Only products labeled for aquatic use are legal to apply.
11. What does “half-life” refer to in aquatic pesticides?
A. Time to mix
B. Time to evaporate
C. Time for 50% breakdown
D. Time before reapplication
ANSWER : C
Explanation: Half-life measures how long the pesticide remains active.
, 12. Which aquatic pest is an insect?
A. Duckweed
B. Hydrilla
C. Mosquito larvae
D. Algae
ANSWER : C
Explanation: Mosquito larvae are aquatic insects commonly controlled.
13. What is biomagnification?
A. Dilution of pesticides
B. Accumulation in food chains
C. Rapid degradation
D. Water evaporation
ANSWER : B
Explanation: Pesticides can increase in concentration up the food chain.
14. Which method reduces pesticide drift into water?
A. Aerial spraying
B. High pressure spraying
C. Spot treatment
D. Windy application
ANSWER : C
Explanation: Spot treatments limit pesticide movement.
15. What must be done before treating public waterways?
A. Notify fish
B. Obtain permits
C. Drain water
D. Increase dosage
ANSWER : B
Explanation: Permits are required for public and regulated waters.
