Practice question

Protoplast on cell wall (B) is correct here. This is core BASICS of PLANT: once you know the definition or pathway step, Protoplast on cell wall is the clear fit. The wrong ones are A) Cell wall on protoplast; C) Vacuole on nucleus; D) Membrane on cytoplasm. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.