Final answer:
A negative biological test indicates that no microorganisms survived in a given condition or treatment, suggesting an effective intervention. Positive results, in contrast, imply that microorganisms are still viable, indicating possible infection or ineffective treatments. The correct option is 2) Negative
Step-by-step explanation:
If no microorganisms survive, the biological test is considered negative. The result implies that the bacteria or microorganisms introduced to a certain condition or treatment, such as a disinfectant or antibiotic, were completely destroyed, preventing any possible illness.
For example, the in-use test is designed to check for contamination within disinfectant solutions in a clinical setting by looking for microbial growth on agar plates after inoculation with the solution in question. If the test reveals no growth (no colonies), then the test is considered negative, indicating an effective disinfectant that has effectively eliminated microbial contaminants.
Positive results, on the other hand, would indicate the presence of viable microorganisms that survived the conditions they were subjected to. This could imply potential infection or ineffective treatments. The correct option is 2) Negative