CPA Pesticide Safety & Handling 3 — Questions and Answers
Question 1: Which route of pesticide exposure is most commonly responsible for occupational poisonings?
- Inhalation through the lungs
- Ingestion through the mouth
- Dermal absorption through the skin (Correct answer)
- Ocular absorption through the eyes
Correct answer: Dermal absorption through the skin
Dermal (skin) absorption accounts for the majority of pesticide exposures in agricultural workers due to constant skin contact.
Question 2: A pesticide with a high vapor pressure is most likely to present what type of hazard?
- Increased groundwater leaching risk
- Elevated inhalation risk due to volatilization (Correct answer)
- Greater soil-binding potential
- Higher risk of skin sensitization
Correct answer: Elevated inhalation risk due to volatilization
High vapor pressure means the pesticide readily evaporates, increasing the concentration of toxic vapors in the air.
Question 3: When should an applicator wash hands after handling pesticides?
- Only after handling undiluted concentrates
- Only if hands appear visibly contaminated
- Before eating, drinking, smoking, or using the restroom, and after work (Correct answer)
- At the end of the workday only
Correct answer: Before eating, drinking, smoking, or using the restroom, and after work
Hands should be washed before any activity that could transfer pesticide residues to the mouth or face, and always after work.
Question 4: What is the purpose of the Hazard Communication Standard (HazCom) Safety Data Sheet (SDS) for pesticides?
- To replace the pesticide label as the legal use document
- To provide detailed health, safety, and emergency response information (Correct answer)
- To list all approved application sites for the product
- To certify the product's registration with the EPA
Correct answer: To provide detailed health, safety, and emergency response information
The SDS provides comprehensive health hazard, first aid, firefighting, and spill response information for handlers and emergency responders.
Question 5: Organophosphate and carbamate pesticides cause toxicity primarily by:
- Disrupting the cell membrane of nerve cells
- Inhibiting acetylcholinesterase, causing nerve signal accumulation (Correct answer)
- Blocking sodium channels in muscle tissue
- Interfering with calcium uptake in cardiac muscle
Correct answer: Inhibiting acetylcholinesterase, causing nerve signal accumulation
Both organophosphates and carbamates inhibit acetylcholinesterase, preventing the breakdown of acetylcholine and causing overstimulation of nerves.
Question 6: A pesticide label reads 'Do not apply when wind speeds exceed 10 mph.' This restriction primarily prevents:
- Excessive pesticide use
- Pesticide drift onto non-target areas (Correct answer)
- Equipment corrosion from high winds
- Evaporation of the pesticide before it reaches the target
Correct answer: Pesticide drift onto non-target areas
Wind speed restrictions are set to prevent spray drift, which can expose non-target people, plants, and water bodies.
Question 7: Which statement about pesticide storage is CORRECT?
- Pesticides may be stored in food containers if clearly relabeled
- Original containers may be reused for other chemicals after thorough rinsing
- Pesticides should be stored in their original containers with labels intact (Correct answer)
- Pesticides can be stored near fertilizers to maximize space efficiency
Correct answer: Pesticides should be stored in their original containers with labels intact
Federal law requires pesticides to be kept in their original, labeled containers to prevent misuse and ensure proper identification.
CPA Pesticide Safety & Handling 3
Which route of pesticide exposure is most commonly responsible for occupational poisonings?