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A transverse section of the truck of a t...

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

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These concentric rings represent the annual rings which inform the age of tree. These are formed to formation of spring wood or early wood with wider cavity xylem vessels in spring season and autumn wood of late wood with narrow xlyem vessels in autumn season by cambium.
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