Lower LD50 values indicate higher acute toxicity.

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Multiple Choice

Lower LD50 values indicate higher acute toxicity.

Explanation:
LD50 is the measure of acute toxicity potency, defined as the dose needed to kill 50% of a tested population under specific conditions. The smaller that dose, the more potent the chemical is in causing fatal effects quickly, so its acute toxicity is higher. For example, a substance with an oral LD50 of 5 mg/kg is far more acutely toxic than one with an LD50 of 500 mg/kg. Remember that LD50 values depend on the exposure route and the tested population, but the fundamental relationship holds: lower LD50 means higher acute toxicity.

LD50 is the measure of acute toxicity potency, defined as the dose needed to kill 50% of a tested population under specific conditions. The smaller that dose, the more potent the chemical is in causing fatal effects quickly, so its acute toxicity is higher. For example, a substance with an oral LD50 of 5 mg/kg is far more acutely toxic than one with an LD50 of 500 mg/kg. Remember that LD50 values depend on the exposure route and the tested population, but the fundamental relationship holds: lower LD50 means higher acute toxicity.

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