Final answer:
The epidermis covers the root's exterior and has extensions called root hairs which increase the root’s surface area for better absorption of water and minerals.
Step-by-step explanation:
The epidermis covers the outside of the root and has extensions called root hairs. The root epidermis serves as a protective layer and facilitates absorption. Root hairs are essential as they increase the root's surface area, which is crucial for absorbing water and minerals from the soil. These hair-like structures are extensions of the root epidermal cells and are particularly important in augmenting the root's ability to take in necessary nutrients for the plant's growth and survival.