Additional Water Potential Problems (you can\'t get enough l.) Calculate ??? for

Question

Additional Water Potential Problems (you can't get enough l.) Calculate ??? for a 0.2 Molar NaCl solution (not a cell) at 20 C. (l pt) R-8.32 J mot K I osmolal- 1 x 10 mol m3 H:O MPa Pa x 10 2.) Plant tissue with a 'w--0.7 MPa is placed in a solution with-0.8 MPa. Will the turgor of the cells in the tissue increase or decrease? What will Yw be when the tissue reaches equilibrium with the solution? (hints, equilibrium will be reached when 'w of the cell w of the solution. The amount of water that moves between the two is not significant enough to change ?s). (2 pts) 3.) If a flaccid cell with a Y's- -0.9 MPa is placed in a 0.3 M sucrose solution (it would be the same 'w as your cell at incipient plasmolysis.), will water move into or out of the cell? After equilibrium is reached what will ?w be for the cell? What will y'p be for the cell? (2 pts) 4) A turgid plant cell where y's -1.0 MPa and ?p-04 MPa is placed in a 0.2 M NaCl solution. Which way does water move? What is the ?p for the cell after equilibrium occurs? (2 pts) 5.) Give at least one example of a plant tissue or celltype that has cells with positive(+)p(/ p) 6.) Give at least one example of a plant tissue or cell type that has negative ()Yp (h p 7.) Give at least one example of a substance important to plants or a plant organ for which matric potential (?m) is significant and cannot be ignored. (12 pt)

Explanation / Answer

Since, we are not supposed to answer multiple questions, following the rules here are solutions to the first two questions:

1. ?w = ?Nacl + ?p (pressure potential)

Since this is just a solution with no pressure applied externally, ?p =0

?NaCl = -iCRT

i = ionization constant for NaCl =2

C = 0.2M

R and T given in question.

Since ?p=0, therefore ?w = ?NaCl

2. whether turgor pressure will increase or decrease is determined by comparing the water potential inside and outside the cell. Since the water potential is greater outside, it will cause the water molecules to move inside the cell. This will cause the cells to expand thereby increasing the turgor pressure.

if it reaches equilibrium, the ?w = ? sol

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.