Paper 3 · November 2023 · Cell Structure and Membranes
Osmosis is the net movement of water molecules from a region of
Ahigher solute concentration to a region of lower solute concentration, through any membrane.
Bhigher water potential to a region of lower water potential, through a partially permeable membrane.
Clower solute potential to a region of higher solute potential, without any membrane present.
Dlower water potential to a region of higher water potential, through a partially permeable membrane.
Explanation
Water moves down its own potential gradient, from where it is more concentrated/less negative (higher water potential) to where it is less concentrated/more negative (lower water potential), and only across a partially (selectively) permeable membrane.
Derived from ZIMSEC Biology 6030/3 Paper 3, November 2023, Q1