Final answer:
The movement of water across a membrane is not always passive because there are active transport processes that use energy to move water, despite osmosis being a passive process.
Step-by-step explanation:
The movement of water across a membrane is not always a passive process. Although osmosis, which is the diffusion of water across a semipermeable membrane from a region of higher water concentration to a region of lower concentration, is a form of passive transport, there are instances where water moves across a membrane actively. Normally, osmosis occurs without the need of energy because water moves to equalize solute concentrations on both sides of the membrane. However, cells also use active transport to move water, particularly through structures like aquaporins in certain conditions. Therefore, the statement that the movement of water across a membrane is always a passive process is False.