What does a high vapor-pressure value indicate about a pesticide?

• A. It has a low risk of causing pollution
• B. It is more volatile
• C. It is less effective
• D. It is safer for non-target organisms

Answer: (B)

A high vapor-pressure value signifies that a pesticide is more volatile, meaning it can easily evaporate into the air at normal temperatures. This characteristic is critical because it affects the pesticide's behavior in the environment. When a pesticide is volatile, it can drift away from the application site during or after application, potentially impacting areas that were not intended to be treated. This volatility can lead to increased exposure for non-target organisms and may elevate the risk of environmental contamination.

In contrast, options suggesting low pollution risk, decreased effectiveness, or increased safety for non-target organisms are not directly correlated with high vapor-pressure values and do not align with the nature of volatile chemicals. Understanding vapor pressure is essential for making informed decisions about safe and effective pesticide applications.