What action is required to keep a suspension evenly distributed during use?

• A. Stirring or Shaking
• B. Heating
• C. Cooling
• D. Standing still

Answer: (A)

Keeping a suspension evenly distributed during use relies on agitation. In a suspension, solid pesticide particles are dispersed in a liquid carrier, but they will settle to the bottom over time if the mixture isn’t moved. Stirring or shaking re-disperses those settled particles, ensuring the concentration stays uniform and that the active ingredient is applied consistently through the spray. Without this agitation, the top portions can become concentrated while the bottom forms a sediment, which can lead to uneven performance or nozzle clogging.

Heating or cooling won’t reliably maintain uniform distribution and can change the mixture’s properties or cause other issues, and standing still lets particles settle out entirely. So, periodic stirring or shaking during use is essential to keep the suspension properly mixed.