Which term refers to the pesticide remaining in the environment after application?

• A. Bioaccumulation
• B. Leaching
• C. Residual
• D. Systemic

Answer: (C)

Pesticide residues describe the amount of chemical that remains in the environment after application. After spraying, some of the pesticide doesn’t disappear immediately; it can persist in soil, on surfaces, or in water and gradually degrade or break down over time. This lingering presence is what we call residues or residual in environmental fate terms. Knowing about residues helps assess environmental persistence, potential exposure to non-target organisms, and potential residue limits on crops.

Bioaccumulation is about how certain chemicals build up inside living organisms, especially as they move up the food chain, rather than simply staying in the environment. Leaching refers to the downward movement of chemicals through soil with water, which concerns transport to groundwater rather than the overall amount left behind. Systemic describes pesticides that are absorbed and distributed throughout a plant, affecting internal tissues, not the external leftover presence in the environment.