AP BIOLOGY

Detailed explanation-1: -In summary, both the cell plasma membrane and the cytoplasm is needed for osmosis to take place.

Detailed explanation-2: -A semi permeable membrane is a must condition since it facilitates the blocking of solute particles from diffusing through and allows only water molecules to pass through. Obviously, water is the solvent in osmosis hence the concentration of solvent cannot be same if osmosis has to occur.

Detailed explanation-3: -If the medium is hypotonic relative to the cell cytoplasm, the cell will gain water through osmosis. If the medium is isotonic, there will be no net movement of water across the cell membrane. If the medium is hypertonic relative to the cell cytoplasm, the cell will lose water by osmosis.

Detailed explanation-4: -Osmosis occurs across a membrane that is semipermeable. A semipermeable membrane lets only certain molecules pass through while keeping other molecules out. Osmosis is really a type of diffusion involving only water molecules. A third mechanism for movement across the plasma membrane is facilitated diffusion.