When protoxylem develops towards the periphery, it is called
Centripetal xylem
Centrifugal xylem
Endarch
None of the above
Definitions / Explanation :
$(i)$ Endoarch vessels
$(ii)$ Exoarch vessels
The centrifugal arrangement of the xylem is called
Companion cells in plants are associated with
Active division takes place in the cells of