In pesticide formulations, the active ingredient denotes the component that provides which effect?

• A. Pesticidal component
• B. Inert filler
• C. Solvent
• D. Colorant

Answer: (A)

In pesticide formulations, the active ingredient is the chemical that provides the pesticidal effect—the component that actually controls or kills the target pest. The other ingredients—solvent, inert filler, and colorant—serve to help with formulation, delivery, stability, and handling, but they do not contribute to pest control. So the active ingredient is the pesticidal component responsible for the intended biological action.