18. How can the age of a tree
be estimated from the
analysis of the rings present
on a cross section of its stem?

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For the growth of tree it is
necessary have formation of new
within the stem, a
performed by the vascular .
The vascular cambium is active in
hot seasons ( and spring)
generating a band made of large
vessels. During winter and
the vascular cambium produces
opposite, so small calibered and
a darker band outside the
previous lighter . Therefore two
ring bands made yearly, one lighter
the other darker. By direct count
of these pairs one can estimate
age of the tree.