For a multiple-dose rodenticide, which safety factor is emphasized?

For a multiple-dose rodenticide, which safety factor is emphasized?

• A. Single doses are seldom lethal to non-target organisms
• B. Non-targets are always killed
• C. They require daily watering
• D. They have high secondary poisoning risk

Answer: (A)

The key idea is that these rodenticides work through cumulative exposure. A single feeding doesn’t deliver enough toxin to kill non-target animals, because the lethal dose is reached only after repeated ingestion. That built‑in safety margin—the need for multiple doses to reach a dangerous level—is the safety factor being emphasized. So, a one‑time exposure is seldom lethal to non-target organisms. Other statements don’t fit as the primary safety factor: they either overstate the risk to non-targets from a single exposure, miss the mechanism entirely, or address a related concern (like secondary poisoning) rather than the main design principle of requiring repeated feeding for lethality.

The key idea is that these rodenticides work through cumulative exposure. A single feeding doesn’t deliver enough toxin to kill non-target animals, because the lethal dose is reached only after repeated ingestion. That built‑in safety margin—the need for multiple doses to reach a dangerous level—is the safety factor being emphasized. So, a one‑time exposure is seldom lethal to non-target organisms.

Other statements don’t fit as the primary safety factor: they either overstate the risk to non-targets from a single exposure, miss the mechanism entirely, or address a related concern (like secondary poisoning) rather than the main design principle of requiring repeated feeding for lethality.