Idaho Pesticide Training Practice Test

Question: 1 / 400

Which LD50 value indicates a highly toxic pesticide?

640 mg/kg

5,800 mg/kg

12,840 mg/kg

46 mg/kg

The LD50 value represents the lethal dose of a chemical that causes death in 50% of a test population, typically expressed in milligrams of substance per kilogram of body weight (mg/kg). A lower LD50 value indicates a higher toxicity because it takes a smaller amount of the chemical to be lethal.

In this context, the LD50 value of 46 mg/kg signifies that a relatively small amount of the pesticide is extremely toxic and can cause significant harm or death if ingested. This concentration is much lower compared to the other values presented, making it clear that this pesticide poses a serious risk to health and safety.

Higher LD50 values, such as 640 mg/kg, 5,800 mg/kg, and 12,840 mg/kg signify decreasing levels of toxicity, meaning larger amounts of those substances would need to be consumed to reach lethal levels. Thus, they are less toxic compared to a pesticide with an LD50 of 46 mg/kg.

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