The mechanism that allows plants to absorb water through their roots is known as osmosis and involves root hairs. Root hairs increase the surface area of the root system, enhancing water uptake from the soil. Water enters the root cells through semi-permeable membranes, moving from areas of lower solute concentration (soil) to areas of higher solute concentration (root cells). This process is vital for plant hydration, nutrient transport, and maintaining turgor pressure, which supports plant structure and growth. Osmosis is fundamental to plant health and overall ecosystem functioning.