An LC50 value for a pesticide measures _______ of the test subject.

An LC50 value for a pesticide measures _______ of the test subject.

• A. Allergic response
• B. Skin absorption
• C. Long term health effects
• D. Death

Answer: (D)

LC50 indicates acute lethality—the concentration of a pesticide that causes death in 50% of the test population within a defined exposure period. It specifically measures death as the outcome, not allergic reactions, skin absorption, or long-term health effects. For example, if a pesticide has an LC50 in fish of a certain value, that means half the fish die at that concentration after the test duration. Other endpoints would be used to assess sublethal effects, absorption rates, or chronic toxicity, which are not what LC50 captures.

LC50 indicates acute lethality—the concentration of a pesticide that causes death in 50% of the test population within a defined exposure period. It specifically measures death as the outcome, not allergic reactions, skin absorption, or long-term health effects. For example, if a pesticide has an LC50 in fish of a certain value, that means half the fish die at that concentration after the test duration. Other endpoints would be used to assess sublethal effects, absorption rates, or chronic toxicity, which are not what LC50 captures.