Osmosis is the diffusion of water, and can be driven by many different factors, including temperature, pressure, the nature of the location, and solute concentration. Which of these is a requirement for osmosis to occur?     Water must flow from low to high water potential.   Only within plant cells is pressure required.   Temperature must be above 30 C.   There must be a semipermeable membrane.

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.