Which best describes a dilution test used to evaluate disinfectant effectiveness? Multiple Choice Disinfectant is placed in a 2mm well on a agar plate that has a lawn of bacteria covering the plate to measure survival. Disinfectant is placed on small paper discs then placed on agar plates containing a lawn of bacteria to measure survival. Microbe-contaminated stainless steel carriers are immersed in a disinfectant for 10 minutes then followed by culturing for enumeration. Serially diluted disinfectants are inoculated with microbes then followed by culturing at various temperatures.