Question

The term used to determine the age of a tree by counting the annual ring is called
A. Dendrochronology
B. Ageing and development
C. Chronology
D. None of the above

Answer 1

Every year the tree forms new cells arranged in concentric circles called annual rings or annual growth rings. These annual rings indicate the amount of wood created during a single growing season. The growing season in Canada and the northern United States starts in the spring.

Complete answer: The cambium is less active in the secondary xylem region in autumn and more active in spring. Thus, two zones of secondary xylem are formed each year and both can be easily demarcated. These two zones constitute an annual or growing ring. By counting the number of rings, it is possible to know the age of the plant. The research is known as dendrochronology. The outermost layer is the phloem, which is usually referred to as the inner bark. This is food conducting tissue. Xylem is present in the cambium layer which is a vascular tissue. It has the function to transport water and minerals. The girth of a tree can be used to calculate its age, as it can increase its girth by around 2.5cm in a year. Thus weigh around 1m from the ground around the trunk of the tree (the girth).
Thus, the correct answer is option A.

Note: Occasionally, trees can produce more than one ring in a year. The extra ring is known to be a false ring that may be the result of dry friction in the middle of the growing season. Often the tree is going to be a year without a circle.