What is the epidermal cell modification in plants which prevent water loss ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a specific modification in epidermal cells of plants that helps in preventing water loss.

2. **Identifying the Key Modification**: The key modification that helps in preventing water loss is the presence of **bulliform cells**.

3. **Location of Bulliform Cells**: Bulliform cells are primarily found in the epidermis of grasses. This is important as it indicates that this modification is more common in certain types of plants.

...