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A transverse section of the trunk of a ...

A transverse section of the trunk of a tree shows concentric rings which are known as growth rings . How are these rings formed ? What are the significance of these rings ?

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Growth rings denotes the combination of early wood and late wood formed during spring season and winter season respectively and the rings are more evident due to high density of late wood . Growth rings (annual rings ) in a cut stem can be used to calculate and determine the age of a tree .
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