Bulk flow and diffusion: * Many molecules move at a time in bulk flow of liquids, but only one molecule at a time by diffusion. Both methods of transport occur in plants. Bulk flow requires a pressure gradient. Diffusion requires a concentration g...
In general, bulk flow in plants is a quicker process than osmosis or diffusion, both of which involve a passive transport of materials from an area of high to low pressure. But diffusion can transfer materials only over short distances, which is a problem for tall plants. Bulk flow can push water from the roots of a plant all the way to its leaves.
Bulk flow is the movement of the water through the open capillary column of the xylem. The flow is driven by transpiration so it is faster and moves a large volume of water. 0 0 0
bulk flow is much faster over long distances. when do organisms use bulk flow? to move materials long distances. where does bulk flow transport materials? from areas of high pressure to low pressure. what is necessary for bulk flow? a plumbing system with some sort of tubes and pump (to create pressure)
Start studying anatomy ch. 21 bulk flow-end. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Osmosis is the movement of WATER in or out of a membrane. Thus, all the molecules are alike. I'm not sure what bulk flow is. . .But I'm assuming, from the name, that it is nonspecific as to which molecules enter. Thus, I would say A is correct. Read on. C is incorrect - osmosis happens both in external membranes and internal membranes.
An overview of simple and facilitated diffusion, active transport, and bulk transport- endocytosis and exocytosis.
4.Long-distance flow in the xylem Diffusion vs. Bulk Flow •Diffusion: Net movement down a concentration gradient du e to the random motion of individual molecules. (Note: solutes may move independently of water.) •Bulk flow: Movement of water and solutes together due to a pressure gradient. •Osmosis: movement of water in or out
Bulk flow and osmosis are different; I'm guessing your text might be talking about using osmosis to drive bulk flow, but they are occurring at different stages. For example, if you get your water from a water tower, your house's water pressure is driven by gravity. However, the water tower could be filled by an electric pump.
My understanding of the _expression_ "bulk flow" differs from this. I've taken it not to mean the joint flow of water and solutes, but the large-scale flow of any pressurized fluid as opposed to molecule-by-molecule movement through a membrane passage.