Water Potential

Question 1

…is a concept
fundamental to understanding water movement.

Answer 1

Water potential (Ψw)

Question 2

..nd.. are the two main components that
determine water potential.

Answer 2

Solute potential
(Ψs) and pressure potential (Ψp)

Question 3

Water molecules possess …

Answer 3

kinetic energy.

Question 4

In liquid and gaseous form water molecules are in … that is both …

Answer 4

random motion
rapid and constant.

Question 5

The greater the concentration of water in a system, the greater is its

Answer 5

its kinetic energy or
‘water potential’.

Question 6

…. will have the greatest
water potential.

Answer 6

pure water

Question 7

diffusion ?

Answer 7

water will move from the system containing water at higher water
potential to the one having low water potential. This process of movement
of substances down a gradient of free energy is called diffusion

Question 8

Water potential is denoted by the Greek symbol …and is expressed in
pressure units such as …

Answer 8

Psi or Ψ
pascals (Pa).

Question 9

By convention, the water potential of pure water at …
is taken to be zero.

Answer 9

standard temperatures, which is not under any pressure,

Question 10

If some solute is dissolved in pure water, the solution has fewer free
water and the concentration of water…,

Answer 10

decreases,reducing its water
potential.

Question 11

Hence, all solutions have a lower water potential than …; the magnitude of this lowering due to … is called solute potential or Ψs. Ψs is always …

Answer 11

pure water
dissolution of a solute
negative.

Question 12

The more the solute molecules, the lower(….)is the Ψs .

Answer 12

(more negative)

Question 13

For a solution at
atmospheric pressure (water potential) Ψw ? (solute potential) Ψ…

Answer 13

(water potential) Ψw = (solute potential) Ψ

Question 14

If a pressure … than atmospheric pressure is applied to pure
water or a solution, its water potential…

Answer 14

greater
water potential increases

Question 15

….equivalent to
pumping water from one place to another.

Answer 15

pressure greater than atmospheric pressure is applied to pure
water or a solution,

Question 16

How cell become turgid ?

Answer 16

Pressure can build up in a plant
system when water enters a plant cell due to diffusion causing a pressure built up against the cell wall, it makes the cell turgid

Question 17

Pressure can build up in a plant
system when water enters a plant cell due to diffusion causing a pressure built up against the cell wall, it makes the cell turgidby this …. potential.

Answer 17

increases the pressure

Question 18

Pressure potential is usually….

Answer 18

Positive

Question 19

Pressure potential is usually
positive, though in plants … potential or tension in the water column
in the xylem plays a major role in …

Answer 19

negative
water transport up a stem.

Question 20

Pressure
potential is denoted as …

Answer 20

Ψp

Question 21

Water potential of a cell is affected by both …

Answer 21

solute and pressure
potential.

Question 22

The relationship between solute and pressure
potential is as follows:
…

Answer 22

Ψw = Ψs + Ψp