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 ?

Explanation

The activity of vascular cambium is under the control of amny physiological and environmental factors . . In temperate regions , the climate conditions are not uniform throughout the year . In the spring season , cambium is very active and produces a large this season is called spring wood or early wood The tracheary elements are fairly thin walled . In winter /tracheids and this wood is called = autumn wood or late wood .