Physical methods used to control microbial growth include all of the following except?

• A. Refrigeration.
• B. Air filtration.
• C. Liquid chemical disinfectants.
• D. Steam (moist heat).

Answer: (C)

Verified step by step guidance

1. Understand the concept of microbial growth control: Microbial growth control involves methods to inhibit or kill microorganisms to prevent their spread and contamination.
2. Identify physical methods of microbial control: Physical methods typically involve non-chemical approaches such as temperature control, filtration, and radiation.
3. Examine each option: Refrigeration slows microbial growth by reducing the temperature, air filtration removes microorganisms from the air, and steam (moist heat) kills microorganisms through high temperature and pressure.
4. Recognize the exception: Liquid chemical disinfectants are not a physical method; they involve chemical agents to kill or inhibit microorganisms.
5. Conclude the analysis: The correct answer is the option that does not fit the category of physical methods, which is liquid chemical disinfectants.