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Q. In a microbiology laboratory, the technician uses heat to sterilise the nutrient solution that is used to grow a fungus. When the heating system broke down, he sterilised the solution by passing it (in a sterile environment) through a sterile filter with a pore size of $0.2 $ micrometers. When the fungus was grown on the filtered nutrient solution, it stopped growing and looked unhealthy within a few days. Which statements is the most likely explanation for the observed effects on the fungus?

Microbes in Human Welfare

Solution:

The nutrient solution could have contained a virus which passed easily through the sterile filter of pore size of $0. 2$.micrometer. This caused retarded and unhealthy growth of the fungus.