What term is used for pesticides that accumulate in the bodies of organisms?

The term used for pesticides that accumulate in the bodies of organisms is "accumulative." Accumulation refers specifically to the process by which certain substances, such as pesticides, build up in the tissues of living organisms over time. This can happen when the rate of exposure or absorption of the pesticide exceeds the rate at which it is excreted or metabolized. Accumulative pesticides can lead to increased concentrations within organisms, potentially resulting in toxic effects.

In contrast, "volatile" refers to a substance that readily evaporates at room temperature, which does not pertain to the accumulation in tissues. "Non-persistent" describes pesticides that break down quickly in the environment, thereby having less potential to accumulate. "Residual" pertains to the remaining pesticides on surfaces or in the environment after application but does not capture the concept of bioaccumulation within organisms. Thus, "accumulative" is the most accurate term for pesticides that build up in biological systems.