Question

instructions: in preparat exercises #21 regarding serial dilutions. question 1 1) why are serial dilutions used? all of these options are correct. to determine if a product is contaminated to ensure food and water safety to determine the cfus in an original sample to determine if a product needs to be recalled question 2

Explanation:

Serial dilutions are used in microbiology. Determining CFUs (colony - forming units) in an original sample is a key use. Also, if a product is contaminated (which can be detected by CFU counts), it may need to be recalled. Ensuring food and water safety also involves checking for microbial contamination (using CFU - based methods which often rely on serial dilutions). So all the given options (except maybe the one that is already selected in the image which might be a wrong pre - selection) are correct as they are all related to the applications of serial dilutions in microbiological analysis.

Answer:

All of these options are correct.