Root hairs are formed from extensions of the …………

Explanation

**Step-by-Step Solution:**

1. **Understanding Root Hairs**: Root hairs are tiny hair-like structures that extend from the roots of plants. They play a crucial role in the absorption of water and nutrients from the soil.

2. **Identifying the Source of Root Hairs**: Root hairs are not formed randomly; they originate from specific cells in the root structure.

3. **Epidermis of the Root**: The outermost layer of cells in the root is known as the epidermis. This layer is responsible for protecting the root and facilitating the absorption of water and minerals.

...