Which pesticide is least toxic?

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Prepare for the Penn State Master Gardener Exam with comprehensive quizzes, flashcards, and multiple-choice questions. Each question is accompanied by hints and detailed explanations to help you succeed. Get ready to excel in your exam!

Multiple Choice

Which pesticide is least toxic?

Explanation:
Acute toxicity is assessed using LD50, the lethal dose that kills 50% of test animals. A higher LD50 means you need more chemical to reach that level of mortality, so the substance is less toxic in acute terms. Among these options, imidacloprid has the highest LD50 value (4800 mg/kg), so it is the least acutely toxic. The other pesticides have lower LD50 numbers (carbaryl 590, permethrin 998, cyfluthrin 1730 mg/kg), meaning they are more acutely toxic under the same test conditions. Keep in mind that LD50 is just one measure and doesn’t capture chronic effects or real-world exposure differences.

Acute toxicity is assessed using LD50, the lethal dose that kills 50% of test animals. A higher LD50 means you need more chemical to reach that level of mortality, so the substance is less toxic in acute terms. Among these options, imidacloprid has the highest LD50 value (4800 mg/kg), so it is the least acutely toxic. The other pesticides have lower LD50 numbers (carbaryl 590, permethrin 998, cyfluthrin 1730 mg/kg), meaning they are more acutely toxic under the same test conditions. Keep in mind that LD50 is just one measure and doesn’t capture chronic effects or real-world exposure differences.

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