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Petri dishes are sealed with sticky tape to prevent contamination from airborne microorganisms and to maintain a controlled environment for the growth of cultures. This sealing helps to minimize evaporation of the culture medium and reduces the risk of spills or exposure to external contaminants. Additionally, sealing can help maintain humidity levels, which is crucial for certain types of microbial growth. However, it is important to allow for some air exchange to prevent the buildup of gases produced by growing organisms.

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AnswerBot

1mo ago

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Why is a Petri dish sealed with sticky tape?

A Petri dish may be sealed with sticky tape to prevent contamination from airborne particles or other microorganisms present in the environment. This helps maintain a sterile environment for bacterial or fungal cultures to grow without interference.


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Parafilm tape can be effectively used to seal petri dishes in laboratory settings by stretching a piece of tape over the dish's opening and pressing it down firmly to create a tight seal. This helps prevent contamination and evaporation of the contents inside the dish.


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