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- a. A flaccid plant cell has a water potential of –0.6 MPa. Fill in the water potential equation for this cell.
- b. The cell is then placed in a beaker of water (Ψ = 0 MPa). Fill in the equation for the cell after it reaches equilibrium in pure water. Explain what happens to the Ψ of this cell.
- c. Explain what would happen to the same cell if it is placed in a solution that has a water potential of –0.8 MPa. Fill in the equation for the cell after it reaches equilibrium in the solution.
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Chapter 36 Solutions
Study Guide for Campbell Biology
- Water potential a) The value for Ψ in root tissue was found to be -3.3 bars. If you take the root tissue and place it in a 0.1 M solution of sucrose at 20°C in an open beaker, what is the Ψ of the solution, and in which direction would the net flow of water be? b) NaCl dissociates into 2 particles in water: Na+ and Cl-. If the solution in question 4 contained 0.1M NaCl instead of 0.1M sucrose, what is the Ψ of the solution, and in which direction would the net flow of water be? c) A plant cell with a Ψs of -7.5 bars keeps a constant volume when immersed in an open-beaker solution that has a Ψs of -4 bars. What is the cell’s ΨP?arrow_forwardB) If you have a mesophyll cell in a leaf (a living, parenchyma cell in a leaf) with a slight positive turgor pressure (Yp = 0.01 MPa) and solutes (Ys = -3.0 MPa), and it is next to a xylem vessel element with very few solutes in the xylem sap (Ys = -0.01 MPa) but high physical tension (Yp = - 2.0 MPa), which way will water flow? a) from the mesophyll cell into the vessel element b) from the vessel element into the mesophyll cell c) neither direction. They are at equilibrium. Activa GoroSearrow_forwardIn a photosynthetic investigation, a student measured the following pH of the stroma and the inner thylakoid compartments of spinach leaf cells at the conclusion of the experiment. Source of Fluid pH (mean) Standard Error of Mean (SEM) Stroma 8.2 0.75 Inner compartment of thylakoid 5.6 0.35 Make a prediction for the pH levels in the plant if it closes its stomata for an extended period of time. Justify your predictions.arrow_forward
- Which the following statement is FALSE:?a. Relative water content is not a very sensitive index because leaves can show strong responses to <2% change in RWCb. Relative water content is not a very sensitive index because it gives no information about the forces for water movementc. Relative water content is equal the ratio of the mass of water in a given leaf over the mass of water when that leaf was fully saturatedd. Relative water content is equal the ratio of the mass of water in a dry leaf over the mass of water when that leaf was fully saturatedarrow_forwardIf you place a flaccid plant cell with ΨS = -0.4 MPa in pure water, which of the following will occur? A. Water will not enter the cell because the flaccid cell has solutes and low water potential. B. Water enters the cell because the flaccid cell has solutes and low water potential. C. Water enters the cell because the flaccid cell has solutes and high water potential. D. Water will not enter the cell because the flaccid cell has solutes and high water potential.arrow_forwardW lhai is une tonicity of the ceii if its ECF is surrounded by 20% soiute and iCF conains 13% soiute? Show your solution. Draw the solid arrows to indicate the net movement of the solutes into and/or out of the cell. Is the tonicity of the cell isotonic, hypertonic or hypotonic? ICF ECF 15% 20% 4. What is the cell tonicity of the plant if its ECF has 73% salt and its ICF has 10% salt? Show your solution. Draw the solid arrows to indicate the net movement of the solutes into and/or out of the cell. Is the tonicity of the cell isotonic, hypertonic or hypotonic? ICF ECF 10% 73%arrow_forward
- Imagine a cell with a water potential of –0.1 MPa being placed in a beaker of solution that also has a water potential of –0.1 MPa. Are the two water potentials in equilibrium? Would any water molecules be moving between the cell and the solution? Would there be a net movement of water? Now imagine a root in moist soil, and imagine that the root cortex cells have a water potential of –0.1 MPa and that the soil solution also has a water potential of –0.1 MPa. Would there be any net movement of water into the root?arrow_forwardA of Y, = 0.2 Y, = -0.7 Y, = 0.8 Y, = -0.9 || Based on this diagram of two plant cells, what direction do you expect water to move? (Calculate the water potentials for each cell to determine the direction) Select one: O a. A to B O b. B to A O c. No movement O d. You cannot tell based on this information 口arrow_forwardWhen leaf water potential increases why does hydraulic conductivity increase as well in plants?arrow_forward
- i. Based on Figure 2, identify the structure that regulates the movement of water and minerals towards the xylem in the root ii. Predict what will happen to the transportation of water and minerals through the plasma membrane if the root was poisoned and no cellular respiration occurred. iii. . Nitrate and phosphate are important anions for plants. Explain how the movement of protons (H+) influence the anions uptake across the plasma membrane of the root hair cellsarrow_forwardDRAW IT Draw a simple sketch of cation exchange, showinga root hair, a soil particle with anions, and a hydrogen iondisplacing a mineral cation.arrow_forwardIf I slid a plant cells with a water potential averaging -.5 MPa Are placed into solution with a water potential of -.3 MPa, which of the following would be the most likely outcome?arrow_forward
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