please answer all 20) In \"plain English\", what does this formula , -RTc, signi

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please answer all

20) In "plain English", what does this formula , -RTc, signify and what are the compo A) Joules/mole Joules/meter 22) If a plant cell (or cells, such 21) The most common unit for water potential (potential ener Calories/Liter of water) is Pascals. A Pascal is C) Newtons/Liter D) Calories/Liter E) Volts/meter Newtons/Liter E) as those in a potato tuber) with a solute potential of-0.8 MPa is placed in a a potato tuber) beaker of pure wat water) is reached? water from equilibrium? er, what will be the internal pressure once a new equilibrium (no net movement of If the cell(s) is then transferred to a beaker of brackish (salty) iman estuary with a solute potential of -0.3 MPa, what is the internal pressure of the cells) at (Assume the volumes of water vastly exceeds the volume of the cel whole system in open to the atmosphere. Be careful of the signs and units) (2 pts) 23) The process where water vapor is lost through the stoma of leaves to create a driving force for xylem transport is called A) root pressure transpirationC) capillary action D) adhesion of water molecules E) cohesion of water molecules 24) When xylem transport is occurring, water is pulled from the roots up to the mature leaves by because mature leaves have w than that in the root xylem A) osmosis; lower B) osmosis; higher C) bulk flow; lower D) bulk flow; higher E) evaporation; lower 25) If an embolism occurs in one tracheid, it will expand to fill the whole tracheid, but is unlikely to expand to other tracheids because A) Ficks law states that gas diffusion through small pores is too slow to affect plant growth B) tracheids have a sealing mechanism that deposits proteins and carbohydrate acros he sieve plat C) tracheids are surrounded by a layer of suberin that prevents gas from moving th D) the force required to overcome the surface tension in the pits it too great E) the plant will quickly grow a new tracheid so the water can pass around the embolism discuss four of these potentials. Give a brief description of each and include if each makes the water potential more negative, more positive or either. (4 pts) 26) Water potential is derived from a number of component potentials. In plant physiology, we commonl

Explanation / Answer

20. This is called Van't Hoff formula where T is absolute temperature, R is gas constant and cs is concentration of solute present in solution. This formula relates osmotic pressure to solute concentration.

21.option c

23. Capillary action

24. Option B. Higher the ¥w more water moves from high to low concentraion.

25. Option B: trachid has sealing mechanism that deposits protein and carbohydrate across sieve plate

26. ¥s =solute potential

¥g = gravitational force

¥p= pressure potential

¥w =water potential

If ¥s>¥p ¥w is negative

If ¥s <¥p ¥w is positive

If ¥s= ¥p ¥w is 0.

Because when solute potential is more than pressure potential water can't move from high to low concentration.

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