EVERYDAY SCIENCE

Detailed explanation-1: -Semipermeable membranes, also termed selectively permeable membranes or partially permeable membranes, allow certain molecules or ions to pass through by diffusion. While diffusion transports materials across membranes and within cells, osmosis transports only water across a membrane.

Detailed explanation-2: -A membrane that is selectively permeable, i.e. being permeable to only certain molecules and not to all molecules. An example of such membrane is the cell membrane wherein it allows passage of only certain types of molecules by diffusion and occasionally by facilitated diffusion.

Detailed explanation-3: -A semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized “facilitated diffusion". ( Wikipedia)

Detailed explanation-4: -Osmosis is the movement of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.

Detailed explanation-5: -They are partially permeable membranes as they allow small molecules such as water molecules to diffuse through them, but not larger molecules such as sugars and salt ions. Osmosis can therefore happen in and out of cells, effecting the amount of water in the cell.