tree roots

HI--I have been wondering what happens to a tree root that is chopped off when digging a hosta hole.  Does it just send out a new extension off the end?   Worse, does it send out a number of smaller, feeder roots?  Does a say, one/two inch diameter root draw water along its length or is the water taken in by small feeder roots?  If that is the case, it would be better to not sever the root and just leave it in place and plant over/around it.  Any comments would be appreciated.
 
Hank Zumach
Stoddard, WI
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