Which signal word is associated with very low oral LD50 values?

Which signal word is associated with very low oral LD50 values?

• A. Danger Poison
• B. Warning
• C. Caution
• D. Immediate Hazard

Answer: (A)

Acute toxicity on pesticide labels is communicated with signal words that reflect how dangerous the product is when ingested or absorbed. The LD50 value measures the dose needed to kill 50% of test animals; a very low LD50 means the chemical is highly toxic. Therefore, the strongest warning is used: “Danger” (often shown as “Danger—Poison”). This signals a high risk and the need for strict precautions. In contrast, “Warning” indicates moderate toxicity and “Caution” indicates relatively low toxicity. “Immediate Hazard” isn’t a standard signal word on pesticide labels, so it isn’t used to convey this toxicity level.

Acute toxicity on pesticide labels is communicated with signal words that reflect how dangerous the product is when ingested or absorbed. The LD50 value measures the dose needed to kill 50% of test animals; a very low LD50 means the chemical is highly toxic. Therefore, the strongest warning is used: “Danger” (often shown as “Danger—Poison”). This signals a high risk and the need for strict precautions. In contrast, “Warning” indicates moderate toxicity and “Caution” indicates relatively low toxicity. “Immediate Hazard” isn’t a standard signal word on pesticide labels, so it isn’t used to convey this toxicity level.