How do plant roots move towards water?

Hydrotropism is a plants growth response to water concentrations. The response can be positive (towards the water) or negative (away from the water). Roots, for instance, are positively hydrotropic. read more

This ability to bend and grow the root towards a moisture gradient is essential because plants need water to grow. read more

Water moves from the soil to the roots by osmosis and causes a positive pressure. This pressure pushes the water upward to the leaves. Root pressure is highest in the morning. The evaporation of water from the leaves to the atmosphere causes a negative pressure in the xylem, which pulls water up from the roots. read more

As water molecules tend to stick, and flow together, the water that escapes from the leaves drags the water in the roots and stems upwards behind it, creating a continuous upward flow of water in the stem. read more