Distinguish between the following : Exarch and endarch condition of protoxylem

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Exarch condition of protoxylem Endarch condition of protoxylem
$(1)$ When protoxylem is towards periphery and metaxylem towards centre such vascular bundles are found in roots. $(1)$ If protoxylem towards centre and metaxylem towards periphery such vascular bundles are called endarch vascular bundles, found in stems. 

 

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