Question

How are exarch & endarch conditions differ anatomically in stem & roots?​

Answer 1

Answer:

Endarch is the arrangement in which the protoxylem is directed towards the centre and metaxylem elements towards the periphery. The development of the xylems in this arrangement follows the centrifugal pattern. It is the characteristics of the stem of flowering plants.

Whereas exarch is the arrangement in which the protoxylem is directed towards the periphery and metaxylem towards the centre. The development of the xylem in this arrangement follows the centripetal pattern. It is the characteristics of roots.

Answer 2

In a vascular bundle endarch is the arrangement when the protoxylem or the older xylem is towards the inside and metaxylem or newly formed xylem is towards the outside. Exarch is the condition when the protoxylem is towards the outside and metaxylem is towads the inside