Water Movement (1)

Movement of substances from one region to another is commonly referred to as translocation. Mechanisms for translocation may be classified as either active or passive. It is sometimes difficult to distinguish between active and passive transport, but the translocation of water is clearly a passive process. Passive movement of most substances can be accounted for by bulk flow or diffusion. The diffusion of water across a selectively permeable barrier is known as osmosis, which must also be taken into account.