Question

Which medium would be easier to identify contamination, a plate or broth? Explain your answer

Answer 1

in agar plates, contamination can be examined by the way contamination took place. If the contaminants are embedded in the agar, the contaminant was poured into the medium. If the contamination is beneath the agar it could have been in the dish before it was poured or entered when the lid was being opened to pour. If the contamination is present on top it could have come in before the lid was closed after pouring, or while the lid was opened to wipe out condensation or when the plate was being inoculated.