Pesticide Applicator Practice Test – Pass The Wisconsin Exam In 2026

What does LD 50 measure?

Effectiveness of a pesticide on plant growth Half-life of a pesticide in the environment Level of toxicity required to kill half the test animals Persistence of pesticide effects on target pests

Correct Answer:

Level of toxicity required to kill half the test animals

Explanation:

LD 50 measures the "level of toxicity required to kill half the test animals." This is a standardized measure used to determine the potential harm or toxicity of a substance. It does not measure the effectiveness of a pesticide on plant growth (A), as it is only concerned with the impact on animals. It also does not measure the half-life of a pesticide in the environment (B), as this is a measure of how long it takes for half of the substance to degrade. LD 50 also does not measure the persistence of pesticide effects on target pests (D), as this would only be relevant for surviving pests, whereas LD 50 is concerned with determining harm or lethality.

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