Growth rings occurs in :

Options

A. Extrastelar region
B. Stelar region
C. Periderm
D. Bith stelar and extrastelar regions

Answer

### Step-by-Step Solution:

1. **Understanding Growth Rings**:
- Growth rings are layers of wood that are added to the bark of trees during a single growth period. Each ring represents one year of growth.

2. **Formation of Growth Rings**:
- During the growing season, trees add new layers of wood. However, if there are adverse conditions like drought, it can affect the growth rate.

3. **Annual Rings**:
- Typically, one growth period results in one annual ring. However, under certain conditions, such as drought, trees may produce more than one ring in a single year. These additional rings are referred to as pseudo-annual rings.

4. **Cork Cambium Activity**:
- The formation of these rings is influenced by the activity of the cork cambium, which is a layer of cells that contributes to the growth of the bark.

5. **Location of Growth Rings**:
- Growth rings occur in the extracellular region of the plant, specifically in the vascular cambium, which is responsible for secondary growth in plants.

### Final Answer:
Growth rings occur in the extracellular region of trees, specifically due to the activity of the cork cambium.

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