Visking tubing models semi-permeable barriers in osmosis

Steps:

• Identify Visking tubing as a selectively permeable membrane allowing water but not solutes like starch.
• Recall plant osmosis involves rigid cell wall, plasma membrane (cell surface), and tonoplast (vacuole membrane).
• Compare: Visking tubing mimics permeability of membranes but lacks structural features of plant components.
• Conclude it represents a general model, not specific plant structures listed.

Why B is correct:

• Visking tubing serves as an artificial analog for diffusion/osmosis processes, not tied to definitions of plant-specific organelles like membranes or walls.

Why the others are wrong:

• A: Visking tubing cannot model both membranes simultaneously or the impermeable cell wall.
• C: Tonoplast is the vacuolar membrane in plants; Visking tubing is a generic lab tool, not specific to vacuoles.
• D: Cell wall is rigid and non-permeable to water; Visking tubing is flexible and permeable.

Final answer: B