plz explain the activity of cambial ring.
The cambial ring becomes active and begins to cut off
new cells, both towards the inner and the outer sides. The cells cut off towards pith,
mature into secondary xylem and the cells cut off towards periphery mature into
secondary phloem. The cambium is generally more active on the inner side than on
the outer. As a result, the amount of secondary xylem produced is more than
secondary phloem and soon forms a compact mass. The primary and secondary
phloems get gradually crushed due to the continued formation and accumulation of
secondary xylem. The primary xylem however remains more or less intact, in or
around the centre. At some places, the cambium forms a narrow band of
parenchyma, which passes through the secondary xylem and the secondary phloem
in the radial directions. These are the secondary medullary rays.