Question:
Protoxylem is the first formed xylem. if the protoxylem lies next to pholem. What kind of arrangement of Xylem would you call it ?
Answer:
The protoxylem is located towards pericycle and metaxylem towards centre. Hence the primary xylem differentiates in a centripetal direction and termed as exarch. According to number of protoxylem poles dicot roots are termed as diarch, triarch, tetrach.
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