Name the following :
The opening found on older stems.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Structure of Older Stems**: In older stems of plants, the epidermis, which is the outer layer of cells, is replaced by a layer called cork cambium.

2. **Function of Cork Cambium**: The cork cambium is responsible for producing new cells. It divides and adds cells to both the outer and inner sides of the stem.

3. **Formation of Openings**: As the cork cambium adds cells, there are areas where the outer layer is not continuous. This results in small openings in the stem.

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