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Sample questions
Two insecticides are being compared. Product A has an oral LD50 of 5 mg/kg and Product B has an oral LD50 of 500 mg/kg. Which product is MORE acutely toxic by the oral route?
- Product B, because its LD50 number is larger
- Both are equally toxic, since LD50 only measures the active ingredient
- Product A, because a lower LD50 means it takes less to kill 50% of the test animals ✓
- Neither - LD50 cannot be used to compare two different products
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Under EPA labeling rules, the signal word WARNING corresponds to which acute toxicity category?
- Toxicity Category I (highly toxic)
- Toxicity Category IV (very low toxicity)
- Toxicity Category III (slightly toxic)
- Toxicity Category II (moderately toxic) ✓
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Which statement correctly distinguishes acute toxicity from chronic toxicity?
- Acute toxicity only applies to herbicides, while chronic toxicity applies to insecticides
- Acute toxicity results from a single, short-term exposure; chronic toxicity results from repeated or long-term exposure ✓
- Acute toxicity is always more severe than chronic toxicity
- Acute toxicity is measured in the field, while chronic toxicity is measured only on the label
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