Final answer:
Root hairs are extensions of the epidermal cells in the root that greatly increase the surface area for the absorption of water and nutrients.
Step-by-step explanation:
The root hairs are hair-like structures that are extensions of the epidermal cells in the root. They greatly increase the surface area of the root available for the absorption of water and nutrients from the soil.
The epidermis, which is the outer layer of cells in the root, surrounds areas of ground tissue and vascular tissue. It provides protection and helps in absorption. The root hairs, being extensions of the epidermal cells, significantly contribute to the absorption of water and minerals.
Overall, the root hairs play a crucial role in increasing the efficiency of water and nutrient absorption by the root.