DO refrigerate them, if they are browning faster than you can eat them- the skin will darken but the fruit will stay fresher longer. To slow ripening, don't store bananas with other fruit- ie the typical fruit basket or bowl is not a good idea for bananas, as they ripen too fast.
To keep the flesh of a peeled banana from turning brown, mist it or dip it in the juice of an acidic fruits such as lemon, lime, orange, or pineapple. There are also commercial preparations such as Ever-Fresh and Fruit-Fresh, which have a similar effect.
Store bananas away from other fruits, as the ethylene gas given off affects ripening. Ripening can be halted by placing the banana in the refrigerator, but this will cause the skin to darken considerably.
or Place bananas in a brown paper bag and store in the refrigerator. they stay fresh longer and the turning brown process is much slower.
You could try some freshly squeezed lemon juice. It works on apples. :)
http://www.articlesbase.com/food-and-beverage-articles/keep-apple-slices-from-turning-brown-naturally-1238490.html
sprinkle with lemon juice
Bananas go brown when exposed to air, the lemon will prevent this
Yes it should. Potatoes turn brown when exposed to air. Covering them with any liquid should keep them from turning brown.
To keep them from drying out and turning brown
you don't
cause it gets pooped on
no it can't
Possibly lack of moisture at the roots.
Oxygen. Dip apple slices in lemon juice to keep them from turning brown.
A hypothesis doesn't have to be a correct statement. Just pick a chemical and say this one will or will not keep the fruit from turning brown. Then give a brief statement about why you think this way.