During the secondary growth of roots, which of the following is true?
Continued growth expands the root and finally causes the splitting, sloughing off, and destruction of the cortex and epidermis
A pith forms in the middle of the root
Primary xylem occupies the middle of the root.
Secondary xylem is formed to the inside and secondary phloem forms to the outside
Pericycle cells and leftover residual procambium cells between the arcs of xylem and phloem divide