Which of the following is NOT a factor that determines whether a pesticide is likely to reach groundwater?

• A. Crop yield
• B. Pesticide properties
• C. Soil properties
• D. Site conditions

Answer: (A)

The main idea is that whether a pesticide reaches groundwater depends on how the chemical behaves in soil and water and on the environmental conditions that govern transport. Pesticide properties like solubility, how strongly it sorbs to soil, how long it persists, and its volatility determine how easily it moves with water or breaks down. Soil properties such as texture, organic matter content, porosity, and pH affect how water and dissolved pesticides flow and how tightly the chemical is held in the soil. Site conditions like rainfall or irrigation amount, drainage, the depth to groundwater, and proximity to wells influence how water moves below the surface and whether it can carry pesticides down to groundwater. Crop yield, while a production outcome that can influence how much chemical is applied, does not directly determine the transport or fate of the pesticide in the soil-water system. So it isn’t a factor in the likelihood of reaching groundwater, whereas the other factors directly affect movement and persistence.