what is centrifugal and centripetal arrangement?

In the xylem, the protoxylem and metaxylem vessels exhibit characteristic orientation with reference to the central axis. On this basis, two types of arrangement can be recognised in the xylem.
  • Centripetal arrangement in which, the younger metaxylem vessels are found towards the pith while the older protoxylem vessels are found away from the pith. In this condition, xylem is described as exarch. It is a characteristic feature of the root.
  • Centrifugal arrangement in which, the older protoxylem vessels are found towards the pith and the younger metaxylem vessels are found away from the pith. In this condition, xylem is described as endarch. It is a characteristic feature of leaves and stem
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Centrifugal:arrangement of flowers frm center to outward(outward frm center) whereas centripetal is reverse of centrifuga i.e outwards to center
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