Lower LD50/LC50 values indicate higher toxicity.

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Study for the Utah Aquatic Pesticide Exam. Utilize flashcards and multiple-choice questions with hints and explanations. Prepare thoroughly for your certification!

Multiple Choice

Lower LD50/LC50 values indicate higher toxicity.

Explanation:
Lower LD50/LC50 values indicate higher toxicity because these metrics show how much of a substance is needed to kill half of the test population. A smaller lethal dose or concentration reaching 50% mortality means the chemical is more potent, so it’s more toxic. When comparing substances, keep the exposure route, species, and duration the same, or the numbers aren’t directly comparable. For example, an LD50 of 5 mg/kg is more toxic than an LD50 of 50 mg/kg, and an LC50 of 0.5 mg/L is more toxic than one at 5 mg/L.

Lower LD50/LC50 values indicate higher toxicity because these metrics show how much of a substance is needed to kill half of the test population. A smaller lethal dose or concentration reaching 50% mortality means the chemical is more potent, so it’s more toxic. When comparing substances, keep the exposure route, species, and duration the same, or the numbers aren’t directly comparable. For example, an LD50 of 5 mg/kg is more toxic than an LD50 of 50 mg/kg, and an LC50 of 0.5 mg/L is more toxic than one at 5 mg/L.

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