Which of the following options is NOT typically an active ingredient in pesticides?

Water is not typically classified as an active ingredient in pesticides. Instead, water is often used as a carrier or solvent in pesticide formulations. It helps dissolve or suspend the active ingredients, facilitating their application and effectiveness when sprayed on target pests or plants.

Active ingredients, on the other hand, are the chemical substances in pesticides that actually control or repel pests. Pyriproxyfen, glyphosate, and chlorpyrifos are all recognized for their pest control properties. Pyriproxyfen is an insect growth regulator, glyphosate is a broad-spectrum herbicide, and chlorpyrifos is an organophosphate insecticide. These substances are specifically formulated to interact with pest biology, thereby performing the intended function of the pesticide.