Difference Between Exarch Xylem and End arch Xylem

Exarch Xylem

 
In Exarch Xylem the protoxylem face towards the periphery or present towards outside.In exarch Xylem the metaxylem is present towards inside.
Exarch Xylem is present in roots of the plants mostly.

Endarch Xylem 

In endarch xylem the protoxylem face towards inside and meta Xylem present towards the periphery or out . The later forming metaxylem pushes the protoxylem towards inside and take its place. 
Endarch Xylem is present in stem of the plants mostly.

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