Distinguish between following
(i) Exarch and endarch condition ofprotoxylem
(iii) Protoxylem and metaxylem
(iv) Interfascicular cambium and intrafascicular cambium
(v) Open and closed vascular bundles
(vi) Stem hair and root hair
(i) In exarch condition Protoxylem towards the periphery.
In endarch condition Protoxylem towards the centre.
(ii) Stele is the arrangement of vascular tissues and vascular bundle is a group of xylem and phloem.
(iii) Protoxylem is an early formed xylem and metaxylem is late formed xylem.
(iv) Interfascicular cambium is formed by permanent tissues. Intrafascicular cambium is present in between the primary xylem and primary phloem of a vascular bundle.
(v) Open vascular bundles have intrafascicular cambium and show secondary growth. Closed vascular bundles do not have intrafascicular cambium.
(vi) S.tem hairs are multicellular, whereas root hairs are unicellular.