Question

Fill in the missing values in the table below and use it to answer the questions, p (MPa) 's (MPa)w (MPa) Compartment A 0.14 0.31 Compartment B +0.28 Compartment C -0.66 0.11 0.11

1. The direction of water flow will be from Compartment _____ to Compartment _____ to Compartment _____.

2. If Compartment A was a root and Compartment C was the soil, would the plant be able to take up water?

3. If Compartment A was a root and Compartment C was the soil and salt was added to the soil until the soil solution had a molarity of 0.09 M would water uptake be possible?

Answer 1

Answer=Calculations

Fill in the missing values in the table below and use it to answer the questions. p (MPa)s (MPa) Compartment A +0.14 Compartment B +0.28 Compartment C-0.22MPa 0.31 -0.38 MPa 0.11 0.45 MPa 0.66

For compartment A

Given $\psi$_P (pressure potential ) = +0.14 MPa

$\psi$w (water potential) = -0.31 MPa

$\psi$_S (solute potential ) = ?

we know the formula for water potential is

$\psi$w (water potential) = $\psi$_P (pressure potential ) + $\psi$_S (solute potential )

$\psi$_S (solute potential ) = $\psi$w (water potential) - $\psi$_P (pressure potential )

= -0.31 - 0.14

= - 0.45 MPa

For compartment B

$\psi$p = + 0.28 MPa

$\psi$s = -0.66 MPa

$\psi$ w = ?

$\psi$w (water potential) = $\psi$_P (pressure potential ) + $\psi$_S (solute potential )

= +0.28 + (-0.66)

= -0.38 Mpa

For compartment C

$\psi$s = -0.11 MPa

$\psi$ w =-0.11 MPa

$\psi$p = ?

$\psi$w (water potential) = $\psi$_P (pressure potential ) + $\psi$_S (solute potential )

$\psi$_P (pressure potential ) = $\psi$w (water potential) - $\psi$_S (solute potential )

= (-0.11) - (-0.11)

=-0.22 MPa

answer 1]

1. The direction of water flow will be from Compartment C to Compartment Ato Compartment _B

explaination= movement of water takes place from higher water potential to lower water potential

The water potential is higher in comp.C ,then A & it is lower in comp.B

$\therefore$ direction of water flow will be from Compartment C to Compartment Ato Compartment _B

2. If Compartment A was a root and Compartment C was the soil,the plant will be able be able to take up water

explaination =movement of water takes place from higher water potential to lower water potential

comp.C has a higher water potential & A has lower water potential

3. If Compartment A was a root and Compartment C was the soil and salt was added to the soil until the soil solution had a molarity of 0.09 M water uptake would not be possible