Given figure shows U-shaped tube with two hands A and B separated by a semi-permeable membrane.
(i) Adding solute to the right side lowers the value of $ψ_{s}$ causing water to move to the right side of the tube.
(ii) Applying positive pressure to the left side decreases the value of $ψ_{p}$ causing water to move to the right side of the tube,
(iii) applying negative pressure to the left side decreases the value of $ψ_{p}$ causing water to move to the right side of the tube.
Which of the given statements is/are true?

(i) and (ii)

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(i) only

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(iii) only

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(i), (ii) and (iii)

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Solution

The correct option is B (i) only
According to the given figure, if solute is added to the right side, ψs lowers. This causes water to move to the right side of the tube. When positive pressure is applied to the left side, ψp increases causing water to move to the right side of the tube. Similarly, when negative pressure is applied to the left side, ψp lowers, which causes water to move to the left side of the tube.

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(a) Water will move from side (A) to side (B) if a pressure lower osmotic pressure is applied on pistion (B)
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Q. On a warm summer day, the transpiration pull is the main force that drives from root parenchyma into the root xylem. The table shows values of

ψ_{p}

(pressure potential) and

ψ_{s}

(solute potential) in root xylem and root parenchyma, in kPa. In which of the options (a-d) would transpiration pull cause water to move from root parenchyma into the root xylem?

Root parenchyma		Root xylem
$ψ_{p}$	$ψ_{s}$	$ψ_{p}$	$ψ_{s}$
(a) $200$	$- 190$	$- 200$	$5$
(b) $- 200$	$220$	$65$	$- 5$
(c) $200$	$- 220$	$65$	$- 5$
(d) $200$	$- 220$	$- 65$	$- 5$

Q. In the given figure, the side

B C

△ A B C

has been produced on the left-hand side from

B

D

and on the right -hand side from

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E

. if

∠ A B D = 106^{\circ}

and

∠ A C E = 118^{\circ}

, find the measure of each angle of the triangle.

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