Which statement about pesticide toxicity is true?

The statement about pesticide toxicity that holds true is that a pesticide with an oral LD50 of 5 mg/kg is more toxic than a pesticide with an LD50 of 250 mg/kg. The LD50 (lethal dose for 50% of the population) is a standard measure of acute toxicity. A lower LD50 value indicates that a smaller dose of the substance is required to be lethal, which means that the pesticide is more toxic.

In this context, the pesticide with an LD50 of 5 mg/kg is significantly more toxic than one with an LD50 of 250 mg/kg, as it can cause death at a far lower dosage. This measure helps pest control professionals evaluate the relative risks associated with different pesticides. Understanding these differences in toxicity is crucial for ensuring safety during handling, application, and environmental protection.

The other statements do not hold true: not all pesticides have the same toxicity levels; toxicity can vary based on the formulation of the pesticide; and while higher LD50 values generally indicate lower toxicity, they are not an absolute guarantee that the substance is always safer.