The point of covering something in the fridge is so that you don’t accidentally drop or drip something else into it, and so that they dry more slowly. For examp

The point of covering something in the fridge is so that you don’t accidentally drop or drip something else into it, and so that they dry more slowly. For example, you’ve got a pot of left–over spaghetti in the fridge, then you bring home some fresh chicken for tomorrow. You wouldn’t want any of the fresh chicken juice to drip into the spaghetti accidentally, so you make sure it is covered, or at least higher up than the chicken. You’ve got some limes in there too, but their rind keeps them from drying out. The one you cut in half will start to dry out quickly unless you wrap it in something. Best not to get the chicken juice on the limes either. The rind will protect the part of the limes that you will eat only until you cut them.