The half-life of a pesticide is a measure of its _____ in the environment.

The half-life of a pesticide is a measure of its _____ in the environment.

• A. Persistence
• B. Solubility
• C. Volatility
• D. Toxicity

Answer: (A)

Half-life describes the time it takes for the pesticide’s concentration in the environment to fall by half, which reflects how long it persists despite natural degradation and removal processes. A longer environmental half-life means the chemical remains present longer, increasing potential exposure and persistence in soil, water, or air. Solubility, volatility, and toxicity describe how the chemical interacts with water and air, or how harmful it is, but they don’t measure how long the substance stays in the environment.

Half-life describes the time it takes for the pesticide’s concentration in the environment to fall by half, which reflects how long it persists despite natural degradation and removal processes. A longer environmental half-life means the chemical remains present longer, increasing potential exposure and persistence in soil, water, or air. Solubility, volatility, and toxicity describe how the chemical interacts with water and air, or how harmful it is, but they don’t measure how long the substance stays in the environment.