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Plot a graph between the age of a teak tree (x-axis) and the diameter of the tree along with the number of annual rings (y-axis), using Table 3.7.
| S. No. | Age of the teak tree (Years) | DBH (Diameter at Breast Height) of tree (cm) | Number of annual rings formed |
|---|---|---|---|
| 1. | 5 | 4 | 5 |
| 2. | 10 | 8 | 10 |
| 3. | 20 | 24 | 20 |
| 4. | 25 | 28 | 25 |
| 5. | 30 | 32 | 30 |
| 6. | 40 | 40 | 40 |
View Answer
(i) The graph rises steadily: as the tree gets older, its diameter increases. So the stem keeps growing thicker over time.
(ii) The number of annual rings equals the age in years, and the diameter grows along with it — so more rings mean a thicker, older tree.
(iii) The lateral meristem is responsible for the girth of the stem. It lies in a ring along the stem.
← Back to concept: 3.2.2 Lateral meristem