What cyclic path does water follow in a plant to enable phloem transport? Is it moving...
What cyclic path does water follow in a plant to enable phloem transport? Is it moving by diffusion, bulk flow, or both?
Homework Answers
Phloem is like an enigmaticcentral bank .Phloem transport carbohydrate , produced by photosynthesis and hydrolysis of reserve compound , to sink tissue for growth , respiration and storage . At photosynthetic tissue , carbohydrate are loaded into phloem that raises the solute concentration . The increased solute concentration than raises turgor pressure in the transport stream by drawing water from the xylem through osmosis . At growth and storage sinks , carbohydrate are actively unloaded or passively leak out of phloem , lowering the solute concentration . Warer then move back into the xylem from phloem lowering turgor , and the turgor pressure difference between the loading and unloading sites drives the mass flow of carbohydrate to the sink tissue .
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What cyclic path does water follow in a plant to enable phloem
transport? Is it moving...
3. Explain how phloem loading occurs (both mechanisms), what results, and how this causes the movement...
3. Explain how phloem loading occurs (both mechanisms), what results, and how this causes the movement of water and sucrose through the phloem 4. Describe long-distance transport in phloem through the Munch pressure-flow model 5. Describe the process of phloem unloading. 6. Predict "source" vs. "sink" relationships in plant parts, given a description of environmental influences and metabolic status.
SOMEONE PLEASE HELP 37. Suppose we place a fresh water plant in sea water. What effect...
SOMEONE PLEASE HELP 37. Suppose we place a fresh water plant in sea water. What effect will this have on the plant? a. it wilts b. its stems swell to bursting c. osmosis ceases in the cells d. its internal atmospheric pressure increases 38. A cell “eating” another cell whole involves: a. exocytosis c. glycoproteins b. endocytosis d. facilitated diffusion 39. The concentration of nitrates is often higher in plant root cells than...
Transpiration What is transported? In xylem or phloem? Direction of flow Cells involved (note alive or...
Transpiration What is transported? In xylem or phloem? Direction of flow Cells involved (note alive or dead, which plant groups have them, function) Tracheids: Vessel elements: Does this process require the plant to expend energy? Explain how movement is achieved (how does this work?)
Translocation What is transported? In xylem or phloem? Direction of flow Cells involved (note alive or...
Translocation What is transported? In xylem or phloem? Direction of flow Cells involved (note alive or dead, which plant groups have them, function) Sieve tube elements: Companion cells: Does this process require the plant to expend energy?
Use the pressure-flow model to explain what is likely to happen to water, pressure and solute...
Use the pressure-flow model to explain what is likely to happen to water, pressure and solute potential in the following scenarios and how that is likely to affect sugar transport in the phloem: a. Potatoes rapidly growing and accumulating starch. b. An Arabidopsis thaliana mutant homozygous for a loss-of-function mutation in the sucrose-H+ transporter SUC2. c. A plant watered with salty water accumulating higher than normal levels of Na+ and Cl- ions in the root xylem. d. A plant in...
1,Match the descriptions to the type of transport. - A. ...
1,Match the descriptions to the type of transport. - A. B. C. Water enters a cell because it is hypertonic compared to the extracellular environment, increasing its turgor pressure - A. B. C. Water enters guard cells because the guard cells are hypertonic compared to the surrounding cells - A. B. C. Potassium...
A section of membrane with an aquaporin (AQP) has a water transport rate of about 3...
A section of membrane with an aquaporin (AQP) has a water transport rate of about 3 billion water molecules per second Removal of the AQP lowers the rate to about 40 million water molecules per second (4 x 10 molecules :-). By what factor does the aquaporin increase the rate of water transport in this example? Note that this is a hypothetical situation, and does not reference any specific data or study. However, is a common estimate given for flow...
A section of membrane with an aquaporin (AQP) has a water transport rate of about 2...
A section of membrane with an aquaporin (AQP) has a water transport rate of about 2 billion water molecules per second (2 x 10 molecules-s-4). Removal of the AQP lowers the rate to about 40 million water molecules per second (4.0 x 10' molecules-s-'). By what factor does the aquaporin increase the rate of water transport in this example? Note that this is a hypothetical situation, and does not reference any specific data or study. However, 3 x 10 molecules/s...
1) What 8 guidelines should you follow to enable you to use email efficiently and effectively...
1) What 8 guidelines should you follow to enable you to use email efficiently and effectively when communicating with both valued coworkers and outside parties? 2) When writing for a web site, many of the same standard rules for writing apply whether writing for the Web or print. However, some important differences exist between readers of paper material and web users. What are five differences?
Plant Bio Please type What goes on inside the cell to make auxin flow downward? Draw...
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3. Explain how phloem loading occurs (both mechanisms), what results, and how this causes the movement of water and sucrose through the phloem 4. Describe long-distance transport in phloem through the Munch pressure-flow model 5. Describe the process of phloem unloading. 6. Predict "source" vs. "sink" relationships in plant parts, given a description of environmental influences and metabolic status.
A section of membrane with an aquaporin (AQP) has a water transport rate of about 3 billion water molecules per second Removal of the AQP lowers the rate to about 40 million water molecules per second (4 x 10 molecules :-). By what factor does the aquaporin increase the rate of water transport in this example? Note that this is a hypothetical situation, and does not reference any specific data or study. However, is a common estimate given for flow...
A section of membrane with an aquaporin (AQP) has a water transport rate of about 2 billion water molecules per second (2 x 10 molecules-s-4). Removal of the AQP lowers the rate to about 40 million water molecules per second (4.0 x 10' molecules-s-'). By what factor does the aquaporin increase the rate of water transport in this example? Note that this is a hypothetical situation, and does not reference any specific data or study. However, 3 x 10 molecules/s...
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