Question

Annual rings are well demarcated in trees growing in

• A. Shimla
• B. Bombay / Delhi
• C. Madras
• D. Udaipur

Answer 1

The correct option is A Shimla

Annual rings, can be seen in a horizontal cross section cut through the trunk of a tree. Growth rings are the result of new growth in the vascular cambium, a layer of cells near the bark that is classified as a lateral meristem. This growth in diameter is known as secondary growth. Visible rings result from the change in growth speed through the seasons of the year. One ring generally marks the passage of one year in the life of the tree.

Many trees in temperate zones make one growth ring each year, with the newest adjacent to the bark.

In temperate woody plants (Shimla), the activity of vascular cambium is seasonal. The cambium is less active in autumn and more active in spring.

The difference of growth in secondary xylem results in the formation of alternate rings of autumn wood and spring wood. 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.