how do root hairs of a plant absorb water and ion?

Question

plz...help me as soon as possible....

Answer 1

The roots of a plant at the tip have numerous amounts of root hairs, which increase teh surface area for the absorption of nutrients.

As to how the nutrients are actually absorbed, water can simply be absorbed by the plant hairs, through diffusion or osmosis. And as for the ions, they are carried into the cell along with the water- the root hairs don't absorb pure water, but the soil solution, containing the cations and so on.

Answer 2

There are a couple of systems that work together here, first the cells of the root epithelium and root hairs will actively transport the ions and minerals into the xylem of the root, this creates a consentration gradient that will passively pull the H2O into the xylem. Also there is the cohesive-tension mechanism that moves the xylem sap up the stem, in a nut shell the evaporation of H2O from the leaves creates negative presure gradient in the leaves which pulls the H2O up, as H2O experiences cohesive attraction to other H20 molecules due to hydrogen bonding this upward pull extends all the way down into the root creating another negative presure gradient which helps facilitate the absorption of H2O from the soil.