What is a common property of a suspension in pesticide formulations?

In pesticide formulations, a suspension is characterized by solid particles that do not dissolve in the liquid medium. This property is fundamental to suspensions, as they consist of a solid dispersed throughout a liquid, creating a mixture where the solid remains distinct rather than being absorbed into the liquid. This characteristic is crucial for pesticide applications, as suspensions often provide a controlled release of the active ingredients and can be formulated to ensure that the particles remain adequately distributed prior to application.

When properly mixed, the solid particles will float or settle depending on their density and the liquid's viscosity, but they will not form a solution. This is fundamentally different from solutions where solid substances dissolve fully in the liquid. The other options presented do not accurately describe the nature of suspensions, making the choice regarding undissolved solid particles the most appropriate.