Which factor is crucial for proper food storage to extend shelf life?

The crucial factor for proper food storage that extends shelf life is temperature control and proper sealing. Maintaining the correct temperature is essential in inhibiting the growth of pathogens and spoilage organisms. Different foods have specific storage temperature requirements; for instance, perishable items like dairy and meats must be kept refrigerated to limit bacterial growth.

Proper sealing of food items also plays a critical role in prolonging shelf life by preventing air exposure, which can lead to oxidation and spoilage. By sealing food correctly, it remains safe and favorable for consumption for a longer duration, reducing the risk of contamination, freezer burn, and loss of freshness.

The other options do not effectively contribute to extending the shelf life of food. Color tagging can help in identifying food items but does not influence their preservation. Using large containers for everything might lead to improper storage conditions if the containers aren't appropriately sized for the contents, potentially compromising their integrity. Leaving food uncovered can expose it to contaminants and cause dehydration or spoilage, which is the opposite of effective storage practices.