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Osmosis is the movement of water molecules across a selectively permeable membrane. The net movement of water molecules through a partially permeable membrane from a solution of high water potential to an area of low water potential.
Passive transport further helps in maintaining the dynamic equilibrium of gases, waste, water etc. No net equilibrium is maintained after the process of diffusion or osmosis. Key Differences. Active transport requires energy in the form of ATM while passive transport does not. In active transport molecules move against the concentration gradient but in passive transport, molecules move from high to low concentration.. Types of active transport are endocytosis, exocytosis.