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The best method to determine the age of a tree is
A. To measure its diameter
B. To count the number of leaves
C. To count the number of annual rings in the main stem at the base
D. To measure its height

Answer
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Hint: The cross-section of a tree has certain regions that determine their age. These structures are formed every year when a new wood layer is applied to the trunk or branches of a tree. The climate conditions are not constant throughout the year in temperate regions, although cambium is very active in the spring season and produces a large number of xylary elements.

Complete answer: The number of annual rings is the number of the year a tree is aged because a new layer of wood is introduced to the branches and the trunk each year, as the new wood is produced from the cambium layer between the old wood and the tree bark, the humidity in the tree during the spring season guides the tree's energy to create the large growth cells as the season is changed to the sum of the tree. The annual rings have two parts: the light part and the dark part, the springwood is called the light part and is large as the tree grows throughout that time. Because of the tree's slow growth, the dark section is called the summerwood as it is smaller. Development of rings can be seen in a horizontal cross-section cut through the trunk of a tree, often referred to as tree rings or annual rings. Development rings are the result of new growth in the vascular cambium, which is known as a lateral meristem, a layer of cells near the bark. This diameter growth is known as secondary growth.
Hence, the correct answer is option C.

Note: The scientific method of tree-ring dating is dendrochronology, or tree-ring dating, based on the study of tree ring patterns, also known as growth rings. In several types of wood, dendrochronology may date the time at which tree rings were created, to the exact calendar year. On the cross-section of the trunk, the rings are present and the age of the tree can be estimated by counting these concentric rings.