Annual rings of xylem in a tree indicates:
1. age of stem
2. type of root
3. name of the tree
4. none of these
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In the region of secondary xylem, the cambium is less active in autumn and more active in spring. Thus, in each year two zones of secondary xylem are formed and both can be easily demarcated. These two zones constitute an annual or growth ring. By counting the number of annular rings, it is possible to know the age of a plant. This study is known as dendrochronology.
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These rings can tell us how old the tree is, and what the weather was like during each year of the tree's life. The light-colored rings represent wood that grew in the spring and early summer, while the dark rings represent wood that grew in the late summer and fall.
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