ORIGINAL: ksfowler
(kidding. No idea....but a SUPER weird question!)
It is a very wierd question but it is the the xylem which is located in the inside of the tree it is the part that we burn for firewood
Excactly the xylem is used to transport food from the top of the tree/plant (anything above the ground) to anything under the ground i.e roots, and the phloem (spelling i thinkg) does the opposite.