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Which of the statement given below is not true about formation of Annual Rings in tree?
- Option 1)
Annual rings is a combination of spring wood and autumn wood produced in a year.
- Option 2)
Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively
- Option 3)
Activity of cambium depends upon variation in climate
- Option 4)
Annual rings are not prominent in trees of temperate region.
Answers (1)
Annual ring -
Annual rings are formed due to inequal activity of vascular cambium. In winter or autumn season, the activity of the cambium is less and cuts off small sized xylem elements (vessels) which constitute late wood or autumn wood. The vascular cambium is highly active in spring or summer and secondary xylem is formed.
- wherein
Cells are large with wide lumen. The wood is known as spring wood or early wood. Spring wood is lighter in colour and less dense whereas autumn wood is darker and highly dense.
Annual rings are most prominent in trees of temperate region.
Annual rings refer to an annual formation of wood in plants, consisting of two concentric layers, one of spring wood and others of autumn wood. These layers are formed due to differential activity of cambium caused by variation in climate. These rings are most prominent in trees of temperate regions as these have distinct growing periods and periods when there is no to little growth.
Option 1)
Annual rings is a combination of spring wood and autumn wood produced in a year.
Option 2)
Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively
Option 3)Activity of cambium depends upon variation in climate
Option 4)Annual rings are not prominent in trees of temperate region.
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