AP BIOLOGY

Detailed explanation-1: -Water is absorbed from the ground by osmosis and accumulates in the xylem area of the root. Osmosis absorption induces root pressure and water flows upwards. Complete answer: Root pressure is the transverse osmotic pressure in the root system cells which causes the sap to increase by a plant stem to the leaves.

Detailed explanation-2: -Root pressure is caused by active distribution of mineral nutrient ions into the root xylem. Without transpiration to carry the ions up the stem, they accumulate in the root xylem and lower the water potential. Water then diffuses from the soil into the root xylem due to osmosis.

Detailed explanation-3: -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-4: -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-5: -Root pressure is only able to transport water up to small heights. However, it helps in re-establishing the continuous chains of water molecules in the xylem. Transpirational pull maintains the flow of water molecules from the roots to the shoots.