Answer:
Concentric Rings The
concentric growth rings are called annual rings. These rings areformed due to
the secondary growth. Secondary growth occurs in dicot trees due to theactivity
of cambium which is a meristematic tissue.
The rate of activity
of cambium is more in spring so wood formed has larger wider xylem
cells,whereas wood formed in winter has narrower and smaller xylem elements.
This results in theformation of two rings called growth rings.
By counting
these rings, age of the tree can be determined. This branch of science is known
as dendrochronology or growth ring analysis.
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