AP BIOLOGY

Detailed explanation-1: -Force developed in cortex of root which pushes water into xylem of root is root pressure. As various minerals ions from the soil are actively transported into the vascular tissue of the roots, water follows and increase the pressure inside the xylem. This positive pressure is called root pressure.

Detailed explanation-2: -root pressure, in plants, force that helps to drive fluids upward into the water-conducting vessels (xylem). It is primarily generated by osmotic pressure in the cells of the roots and can be demonstrated by exudation of fluid when the stem is cut off just aboveground.

Detailed explanation-3: -The osmotic pressure built up in the root cells pushes water and minerals (sap) upwards through the xylem. This is called the root pressure.

Detailed explanation-4: -Osmosis plays a central role in the movement of water between cells and various compartments within plants. In the absence of transpiration, osmotic forces dominate the movement of water into roots.

Detailed explanation-5: -The water either goes through the cortex cells (between the root cells and the xylem vessels) or it bypasses them – going through their cell walls. After this, the water moves up the xylem vessels to the leaves through diffusion: A pressure change between the top and bottom of the vessel.