Structural Pest Control Applicator Practice Exam

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How is LD50 used in regards to pesticides?

  1. To categorize pesticides based on their toxicity

  2. To predict effects on humans

  3. To determine the environmental impact

  4. To measure pesticide effectiveness

The correct answer is: To categorize pesticides based on their toxicity

LD50, or lethal dose for 50% of the population, is a standard measurement used to assess the toxicity of substances, including pesticides. This value represents the amount of a substance required to kill half of a test population, typically rodents, and allows for a comparison of the toxic potency of different pesticides. By categorizing pesticides based on their LD50 values, professionals can determine which substances are more hazardous to non-target organisms, including humans and wildlife, thereby making more informed choices about their use and safety measures. In this context, the focus is primarily on human health and environmental safety, aiding in regulatory decisions and appropriate labeling regarding handling and application. The other options, while related to pesticide use and safety, do not directly pertain to the primary function of LD50 measurements. For instance, predicting effects on humans or determining environmental impact involves broader assessments of risk that go beyond just LD50 values, and measuring pesticide effectiveness involves efficacy studies rather than toxicity classification.