The LD50 value is defined as the amount of pesticide that kills 50% of test animals.

The LD50 value is defined as the amount of pesticide that kills 50% of test animals.

• A. The amount that kills all test animals
• B. The amount that kills 10% of test animals
• C. The amount that kills 50% of test animals
• D. The amount that kills 100% of test animals

Answer: (C)

LD50 is the median lethal dose—the amount of pesticide required to kill 50% of a defined test population under specific conditions. This is a statistical measure created from dose–response data, usually estimated from a curve using standard analysis. It’s important to note that the exact value can vary with species, exposure route, and experimental setup, but the core idea remains: the dose at which half of the animals would be expected to die. Lower LD50 means higher acute toxicity, which is why this metric is used to compare pesticides.

LD50 is the median lethal dose—the amount of pesticide required to kill 50% of a defined test population under specific conditions. This is a statistical measure created from dose–response data, usually estimated from a curve using standard analysis. It’s important to note that the exact value can vary with species, exposure route, and experimental setup, but the core idea remains: the dose at which half of the animals would be expected to die. Lower LD50 means higher acute toxicity, which is why this metric is used to compare pesticides.