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Questions and Answers
Name one physical method of controlling bacteria.
Temperature
Disinfection can effectively remove bacterial spores.
False
What is disinfection primarily aimed at eliminating?
Disinfection methods can be classified into _____ and physical methods.
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Match the following methods with their category:
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Which of the following methods can be used for plant treatment?
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Desiccation refers to the process of adding moisture to plants.
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What is a common method for separating solids from liquids in plant treatment?
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_____ is the process involving the movement of water through a semipermeable membrane.
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Match the following terms with their definitions:
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Study Notes
Disinfection
- Disinfection is the elimination of microorganisms and vegetative cells.
Chemical Methods for Controlling Bacteria
- Disinfection methods use chemical substances for surface, seeds, stems, and leaves.
Physical Methods for Controlling Bacteria
- Temperature affects bacterial growth and survival.
- Radiation can kill bacteria.
- Filtration removes bacteria by using a filter paper with pores smaller than the bacteria.
- Desiccation (drying) can inhibit bacterial growth.
- Osmosis can affect bacterial cell integrity.
- Pasteurization is a heat treatment process that eliminates pathogens and extends shelf life.
- Pasteurization uses mild heat, usually less than 100°C.
- It temporarily stabilizes the product to limit microbial growth.
- It's commonly applied to milk, fruit juice, and other products.
- Pasteurization methods include:
- High Temperature for Short Time (H.T.S.T): 71.6°C for 15 seconds followed by cooling.
- Low Temperature for Long Time (L.T.L.T): 61.6°C for 30 minutes followed by cooling.
Bacterial Filtration
- Bacterial filter paper contains small pores, smaller than bacteria.
- Non-sterilized substances are passed through the filter paper to obtain a sterilized substance.
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Description
Test your knowledge on disinfection and methods for controlling bacteria in this quiz. Explore both chemical and physical methods such as pasteurization and filtration. Understand how temperature and environmental factors influence bacterial growth and survival.
