Isotonic Sucrose Solution Causes No Net Water Movement

Steps:

• No size change in potato indicates equilibrium, with no net osmosis occurring.
• Statement 1 is correct: unchanged size means no net water movement into or out of potato cells.
• Statement 2 is correct: equilibrium requires equal water potentials between potato cells and sucrose solution.
• Statement 3 is incorrect: equal water potentials do not require identical sucrose concentrations, as potato cells contain other solutes affecting osmotic potential.

Why B is correct:

• B includes statements 1 and 2, which align with osmosis definition where net water movement stops when water potentials are equal (ψ_cell = ψ_solution).

Why the others are wrong:

• A includes incorrect statement 3.
• C omits correct statement 2 and includes incorrect 3.
• D omits correct statement 1.

Final answer: B