What signal word is required for slightly toxic pesticides?

The signal word required for slightly toxic pesticides is "WARNING." In the context of pesticide labeling, signal words are used to convey the level of toxicity associated with the product. "WARNING" indicates that the pesticide is moderately toxic, meaning that it poses a certain level of risk upon exposure but is generally less hazardous than those designated with the "DANGER" label.

For slightly toxic substances, the correct classification is "WARNING," which helps users understand that while caution is necessary, the level of toxicity is not as severe as that which would warrant a "DANGER" label.

The other options involve either higher toxicity levels or classifications that do not correspond to slightly toxic pesticides. "DANGER" is designated for highly toxic substances, while "CAUTION" is typically used for low toxicity products. "POISON" is another designation often used for highly toxic products or those that can be lethal if ingested or absorbed in sufficient quantities.