A student investigated the uptake of mineral ions by barley plants. The table below shows the concentration of potassium ions in the nutrient solution and inside the root hair cells of the barley plants.
| Location | Concentration of potassium ions (mmol/dm3mmol/dm^{3}mmol/dm3) |
|---|---|
| Nutrient solution | 0.2 |
| Inside root hair cells | 14.5 |
Explain how potassium ions are absorbed by the root hair cells of the barley plants.
