Selective permeability and concentration gradients determine substance movement

Steps:

• Membrane permeable to water and saccharides (sucrose, glucose), allowing diffusion down gradients.
• Statement 1 false: Sucrose higher inside (0.03 mol dm⁻³) vs. outside (0 mol dm⁻³), so diffuses out.
• Statement 2: Glucose higher outside (0.01 mol dm⁻³) vs. inside (0 mol dm⁻³), so diffuses in; but if "no movement" correct per option D, implies no gradient or impermeability to glucose.
• Statement 3 incomplete and diagram missing, preventing full evaluation.

Why D is correct:

• Option D selects 2 and 3, aligning with assumption that glucose does not enter (perhaps membrane selectively blocks despite "saccharides" label) and 3 involves osmosis (higher internal solute draws water in).

Why the others are wrong:

• A includes 1, but sucrose moves out due to gradient.
• B only 1, ignores 2 and 3.
• C includes 1, false as above.

Not enough information for full confirmation without statement 3 and diagram.

Final answer: D