by 
tater tot
ANSWERS: 5
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Only if you intend to have your tires inflated while you ride on them. Removing said valve would force all of the air out of both or either, however many caps you have removed, if any at all.
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Only if you want to protect the valve stem and core from damage caused by debris, thereby preventing air loss.
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I hope not, not one of my tyres has them :S
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It keeps dirt or worse mud out so it you need to put air in you will be able to.
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Yes. It prevents debris from getting into the valve pit and interfering with the operation of the stem.
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