FAPC 4020: FLORIDA AQUATIC PEST CONTROL CERTIFICATION EXAM
TEST BANK – 100 VERIFIED QUESTIONS & ANSWERS
1. What is the primary reason herbicide resistance develops in aquatic plants?
A) Overuse of mechanical removal methods
B) Presence of a resistant biotype within the population
C) Excessive dilution of herbicides in water
D) High dissolved oxygen levels
Answer: B
Explanation: Herbicide resistance occurs when a naturally resistant biotype survives
repeated herbicide applications, reproduces, and dominates the population. This is a
genetic adaptation, not caused by environmental factors like dilution or oxygen levels.
2. Copper-based herbicides are most toxic to fish in which type of water?
A) Hard water
B) Soft water
C) Alkaline water
D) Brackish water
Answer: B
Explanation: Copper ions are more bioavailable (and thus more toxic) in soft water due
to lower carbonate concentrations, which otherwise bind copper and reduce toxicity.
,3. A centrifugal granular spreader applies 16 lbs of material over 0.28 acres. What is the
per-acre application rate?**
A) 45.2 lbs/acre
B) 57.1 lbs/acre
C) 62.3 lbs/acre
D) 71.8 lbs/acre
Answer: B
Explanation: Calculation:
- Area = 28.5 ft (swath) × 430 ft (distance) / 43,560 sq ft/acre = 0.28 acres.
- Rate = 16 lbs / 0.28 acres = **57.1 lbs/acre.
4. Which herbicide mechanism of action is associated with ALS inhibitors?
A) Cell membrane disruption
B) Photosynthesis inhibition
C) Enzyme (acetolactate synthase) inhibition
D) Synthetic auxin mimicry
Answer: C
Explanation: ALS inhibitors (e.g., imazamox, penoxsulam) disrupt the acetolactate
synthase enzyme, essential for branched-chain amino acid synthesis in plants.
,5. What is the key factor in delaying herbicide resistance?
A) Increasing application frequency
B) Rotating herbicides with different mechanisms of action
C) Using higher concentrations of the same herbicide
D) Applying herbicides only in winter
Answer: B
Explanation: Rotating herbicide modes of action (e.g., switching between ALS inhibitors
and auxin mimics) reduces selection pressure on resistant biotypes.
6. A pond contains 42.1 acre-feet of water. How much Never-Kill herbicide (5% AI) is
needed for a 0.8 ppm AI treatment?
A) 1,818 lbs
B) 2,450 lbs
C) 3,000 lbs
D) 1,200 lbs
Answer: A
Explanation:
, 1. Active ingredient (AI) needed**: 0.8 ppm × 42.1 acre-ft × 2.7 = 90.9 lbs AI.
2. Product quantity**: 90.9 lbs AI / 0.05 (5% AI) = **1,818 lbs.
7. Which agency regulates pesticide use in Florida?
A) EPA
B) FDACS
C) FWC
D) USACE
Answer: B
Explanation: The Florida Department of Agricultural and Consumer Services (FDACS)
enforces state pesticide laws, while EPA handles federal registration.
8. What is the 96-hour LC50 value?
A) The time it takes for 50% of a herbicide to degrade
B) The herbicide concentration killing 50% of test organisms in 96 hours
C) The lethal dose for 50% of fish in 96 hours
D) The half-life of a herbicide in water
Answer: B
TEST BANK – 100 VERIFIED QUESTIONS & ANSWERS
1. What is the primary reason herbicide resistance develops in aquatic plants?
A) Overuse of mechanical removal methods
B) Presence of a resistant biotype within the population
C) Excessive dilution of herbicides in water
D) High dissolved oxygen levels
Answer: B
Explanation: Herbicide resistance occurs when a naturally resistant biotype survives
repeated herbicide applications, reproduces, and dominates the population. This is a
genetic adaptation, not caused by environmental factors like dilution or oxygen levels.
2. Copper-based herbicides are most toxic to fish in which type of water?
A) Hard water
B) Soft water
C) Alkaline water
D) Brackish water
Answer: B
Explanation: Copper ions are more bioavailable (and thus more toxic) in soft water due
to lower carbonate concentrations, which otherwise bind copper and reduce toxicity.
,3. A centrifugal granular spreader applies 16 lbs of material over 0.28 acres. What is the
per-acre application rate?**
A) 45.2 lbs/acre
B) 57.1 lbs/acre
C) 62.3 lbs/acre
D) 71.8 lbs/acre
Answer: B
Explanation: Calculation:
- Area = 28.5 ft (swath) × 430 ft (distance) / 43,560 sq ft/acre = 0.28 acres.
- Rate = 16 lbs / 0.28 acres = **57.1 lbs/acre.
4. Which herbicide mechanism of action is associated with ALS inhibitors?
A) Cell membrane disruption
B) Photosynthesis inhibition
C) Enzyme (acetolactate synthase) inhibition
D) Synthetic auxin mimicry
Answer: C
Explanation: ALS inhibitors (e.g., imazamox, penoxsulam) disrupt the acetolactate
synthase enzyme, essential for branched-chain amino acid synthesis in plants.
,5. What is the key factor in delaying herbicide resistance?
A) Increasing application frequency
B) Rotating herbicides with different mechanisms of action
C) Using higher concentrations of the same herbicide
D) Applying herbicides only in winter
Answer: B
Explanation: Rotating herbicide modes of action (e.g., switching between ALS inhibitors
and auxin mimics) reduces selection pressure on resistant biotypes.
6. A pond contains 42.1 acre-feet of water. How much Never-Kill herbicide (5% AI) is
needed for a 0.8 ppm AI treatment?
A) 1,818 lbs
B) 2,450 lbs
C) 3,000 lbs
D) 1,200 lbs
Answer: A
Explanation:
, 1. Active ingredient (AI) needed**: 0.8 ppm × 42.1 acre-ft × 2.7 = 90.9 lbs AI.
2. Product quantity**: 90.9 lbs AI / 0.05 (5% AI) = **1,818 lbs.
7. Which agency regulates pesticide use in Florida?
A) EPA
B) FDACS
C) FWC
D) USACE
Answer: B
Explanation: The Florida Department of Agricultural and Consumer Services (FDACS)
enforces state pesticide laws, while EPA handles federal registration.
8. What is the 96-hour LC50 value?
A) The time it takes for 50% of a herbicide to degrade
B) The herbicide concentration killing 50% of test organisms in 96 hours
C) The lethal dose for 50% of fish in 96 hours
D) The half-life of a herbicide in water
Answer: B
