question 6\nmark this question\nhere a\nwhich of the following is a step in the use-dilution test?\nunit 4…

question 6\nmark this question\nhere a\nwhich of the following is a step in the use-dilution test?\nunit 4 t\n4.1 micro\n4.1\n4.\n4\n4\n4.2 c\na disinfectant is determined to be contaminated by the presence of at least five colonies on a plate.\nthe zone of inhibition is measured.\na chemical diffuses from a piece of filter paper on to an agar plate.\na cylinder is dipped into solutions of varying concentrations of disinfectant.

question 6\nmark this question\nhere a\nwhich of the following is a step in the use-dilution test?\nunit 4 t\n4.1 micro\n4.1\n4.\n4\n4\n4.2 c\na disinfectant is determined to be contaminated by the presence of at least five colonies on a plate.\nthe zone of inhibition is measured.\na chemical diffuses from a piece of filter paper on to an agar plate.\na cylinder is dipped into solutions of varying concentrations of disinfectant.

Answer

Brief Explanations:

The use-dilution test evaluates disinfectant effectiveness by exposing contaminated carriers (like cylinders) to different disinfectant concentrations, then checking for microbial growth. The other options describe different tests: colony count for contamination checks, zone of inhibition/filter paper diffusion are for the disk-diffusion method, not use-dilution.

Answer:

A cylinder is dipped into solutions of varying concentrations of disinfectant.