What is the movement of water molecules across a selectively permeable membrane known as?
The absorption of water by root hair from the soil occurs through osmosis.
Osmosis i s defined as the movement of water across semipermeable membrane . The movement of water occurs from its higher concentration to its lower concentration.
Semipermeable membrane (selectively permeable membrane) is defined as the membrane that allows water molecules to move through and not the solute particles.
The root hair cell is covered by cell membrane that acts as semipermeable membrane. The cell sap contains inorganic and soluble organic solutes. Thus, the concentration of water outside the root hair cell is higher than that inside the cell. The water thus moves inside the cell through cell membrane by osmosis.