In Swedish and, I'm led to believe, British supermarkets, parsnips are often sold pre-clipped. Topped and tailed.
If I have a choice, I prefer to buy my veg with a few leaves on so I can see how fresh it is. So I have rather cynically assumed that this is done to hide the age of the product. Whether or not this is the case, I wonder why the same trimming service is not extended to carrots.
Anyone able to shed some light?
Update: Quite often just the tip of the parsnip is trimmed. This appears to be a global phenomenon; here are some parsnips from an Australian market.
The two answers I've so far received are good, but don't explain why the tip might also be trimmed.