Question

Why do plants need to maintain a higher salt xoncentration than the soil

Answer 1

Answer:

To absorb water passively the plants need to maintain higher salt concentration than soil.

Explanation:

We know that water moves from high water potential to low water potential ( less solute to more) till it attains equilibrium. So in order to absorb water passively from the soil in root hairs cells pump salt actively and water follows water.