16. What is endarch xylem?
17. What is exarch xylem?
Answers
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♦ ENDARCH : Endarch is the arrangement in which the proto xylem is directed towards the centre and meta xylem 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.
♦ EXARCH : Whereas exarch is the arrangement in which the proto xylem is directed towards the periphery and meta xylem towards the centre.
The development of the xylem in this arrangement follows the centripetal pattern. It is the characteristics of roots.
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Explanation:
ENDARCH : Endarch is the arrangement in which the proto xylem is directed towards the centre and meta xylem elements towards the periphery. ... EXARCH : Whereas exarch is the arrangement in which the proto xylem is directed towards the periphery and meta xylem towards the centre.
Exarch is used when there is more than one strand of primary xylem in a stem or root, and the xylem develops from the outside inwards towards the center, i.e. centripetally. The metaxylem is thus closest to the center of the stem or root and the protoxylem closest to the periphery.