Value of osmotic potential $$ ( \pi ) $$ and pressure potential (p) of cells a, b, c, d are given: Cell $$ \pi $$ p a 1.0 0.5 b 0.6 0.3 c 1.2 0.6 d 0.8 0.4 Identify the correct sequence for movement of water.

b $$ \longrightarrow $$ d $$ \longrightarrow $$ a $$ \longrightarrow $$ c

b $$ \longrightarrow $$ c $$ \longrightarrow $$ d $$ \longrightarrow $$ a

c $$ \longrightarrow $$ b $$ \longrightarrow $$ a $$ \longrightarrow $$ d

d $$ \longrightarrow $$ c $$ \longrightarrow $$ a $$ \longrightarrow $$ b

Cell a and cell b are adjacent plant cells. In cell a $$ \Psi_s = -20 $$ bars and $$ \Psi_p = 8 $$ bars . In cell b $$ \Psi_s = -12 $$ bars and $$ \Psi_p = 2 $$ bars. Then:

Water moves from cell b to cell a.

Water moves from cell a to cell b.

There is no movement of water between cell a and cell b.

Equal amount of water is simultaneously exchanged between cell a and cell b.

$$ \Psi_w = \Psi_m + \Psi_\pi + \Psi_p $$

$$ \Psi_w = \Psi_\pi + \Psi_p $$

$$ \Psi_w = \Psi_m \Psi_\pi + \Psi_p $$

The value of water potential $${ \Psi }_{ w }$$ for a solution at atmospheric pressure is :-

$${ \Psi }_{ w }={ \Psi }_{ s }+{ \Psi }_{ p }$$

By which mechanism, the salt resistant plants get rid off excess $$Na^+$$ ions to the outer side through the roots.

$$Na^+ - H^+$$ antiport system.

$$H^+ -$$ ATPase uniport system

0.5 M Sucrose solution develops a pressure of $$15$$ bars in an osmometer. Which of the following statement is WRONG for such a solution?

That its pressure potential is $$-15$$ bars

That its osmotic potential is $$-15$$ bars

That its water potential is $$-15$$ bars

That its osmotic pressure is $$+15$$ bars

In this diagram when the O.P. of the cell $$B$$ increases to $$18$$ , what would be changes with regard to water movement?

Cells $$A, C, D$$ and $$E$$ absorb water from $$B$$

Water diffuses $$B$$ from outer cell

No movement of water will occur

$$B$$ absorb of water will occur

The value of $$\psi$$S is always?

Less for pure water as compared to any solution

MCQ Questions for Class 11 Medical Biology Transport In Plants Quiz 16

What happens when the concentration of solutes decrease in the guard cells?

0%
Water potential decreases
0%
Water potential increases
0%
Osmotic potential increases
0%
None of the above

Apoplast is the system of adjacent cell walls that is continuous throughout the plant except at the

0%
Plasmodesmata
0%
Vessel element
0%
Casparian strips of endodermis
0%
Tracheids

The correct ascending sequence with respect to their water potential is

(a)

π = - 0.8 MPa, P = + 0.4 MPa

$\pi = -0.8 \text{MPa}, P = +0.4 \text{MPa}$
(b)

π = - 1.0 MPa, P = + 0.5 MPa

$\pi = -1.0 \text{MPa}, P = +0.5 \text{MPa}$
(c)

π = - 0.9 MPa, P = + 0.2 MPa

$\pi = -0.9 \text{MPa}, P = +0.2 \text{MPa}$
(d)

π = - 0.3 MPa, P = + 0.2 MPa

$\pi = -0.3 \text{MPa}, P = +0.2 \text{MPa}$

0%
a, b, c, d
0%
c, b, a, d
0%
c, a, b, d
0%
c, d, b, a

During its life, a potato plant transpires water

0%
30 litres
0%
90 litres
0%
155 litres
0%
245 litres

Value of osmotic potential

(π)

$( \pi )$ and pressure potential (p) of cells a, b, c, d are given:

Cell	$\pi$	p
a	1.0	0.5
b	0.6	0.3
c	1.2	0.6
d	0.8	0.4

Identify the correct sequence for movement of water.

0%
b $\longrightarrow$ c $\longrightarrow$ d $\longrightarrow$ a
0%
c $\longrightarrow$ b $\longrightarrow$ a $\longrightarrow$ d
0%
d $\longrightarrow$ c $\longrightarrow$ a $\longrightarrow$ b
0%
b $\longrightarrow$ d $\longrightarrow$ a $\longrightarrow$ c

Components of water potential of four cells of an actively transpiring monocot plant are

Cell	Osmotic Potential	Pressure Potential
a	-0.9	0.5
b	-0.8	0,6
c	-0.6	0.1
d	-0.7	0.4

Identify the four cells as root hair, cortical cell, epidermal and pericycle cells.

0%
b, c, d, a
0%
b, d, c, a
0%
b, d, a, c
0%
a, d, b, c

Water potential in closely placed cell (p, q, r) is given below. Find out correct direction of water movement :

Cell	Osmotic Potential (MPa)	Pressure potential
p	-0.21	0.05
q	-0.22	0.02
r	-0.23	0..05

(a) p

⟶

$\longrightarrow$ q
(b) q

⟶

$\longrightarrow$ r
(c) r

⟶

$\longrightarrow$ p
(d) r

⟶

$\longrightarrow$ q

0%
a, b
0%
b, c
0%
a, d
0%
b, d

Cell a and cell b are adjacent plant cells. In cell a

Ψ_{s} = - 20

$\Psi_s = -20$ bars and

Ψ_{p} = 8

$\Psi_p = 8$ bars. In cell b

Ψ_{s} = - 12

$\Psi_s = -12$ bars and

Ψ_{p} = 2

$\Psi_p = 2$ bars. Then:

0%
Water moves from cell a to cell b.
0%
There is no movement of water between cell a and cell b.
0%
Water moves from cell b to cell a.
0%
Equal amount of water is simultaneously exchanged between cell a and cell b.

Which is incorrect?

0%
$\Psi_w = \Psi_\pi + \Psi_p$
0%
$\Psi_w = \Psi_m \Psi_\pi + \Psi_p$
0%
$\Psi_w = \Psi_s + \Psi_p$
0%
$\Psi_w = \Psi_m + \Psi_\pi + \Psi_p$

Guttation is the release of liquid water from veins at the leaf margins. It is caused by

0%
Transpiration
0%
High leaf pressure
0%
High root pressure
0%
Clogged tracheids or vessel elements.

In __________ pathway, water crosses at least two membranes for each cell in its path (i.e., plasma membrane on entering and exiting).

0%
Apoplast
0%
Symplast
0%
Transmembrane
0%
Both (a) and (c)

Explanation

$\textbf{Correct answer: A}$

$\textbf{Option (A):}$

$\bullet$ In the apoplast pathway, the water does not enter the cytoplasm directly. Water passes through the cell wall and intercellular spaces.

$\bullet$ The movement of water takes place from one cell to another by crossing the plasma membrane.

$\bullet$ Only when the water is not able to move through the cell wall due to the presence of a Casparian strip, water move inside the cytoplasm.

$\bullet$ Therefore water passes through at least two membranes in the apoplast pathway.

$\textbf{Option (B):}$

$\bullet$ In the symplast pathway, the water passes through the cytoplasm.

$\bullet$ There are minute pores in the cell wall called plasmodesmata which connect the cytoplasm of adjoining cells. Water passes through the plasmodesmata without having any barrier stopping its flow.

$\textbf{Option (C):}$

$\bullet$ Water does not move to the transmembrane protein because the water molecule has the ability to pass through the cell membrane.

Hence, the correct answer is option (A).

The value of water potential

Ψ_{w}

${ \Psi }_{ w }$ for a solution at atmospheric pressure is :-

0%
${ \Psi }_{ w }={ \Psi }_{ s }$
0%
${ \Psi }_{ w }=zero$
0%
${ \Psi }_{ w }=-{ \Psi }_{ s }$
0%
${ \Psi }_{ w }={ \Psi }_{ s }+{ \Psi }_{ p }$

Explanation

The value of water potential

Ψ_{w}

${ \Psi }_{ w }$ for a solution at atmospheric pressure is equal to the solute potential i.e.,

Ψ_{w} = Ψ_{s}

${ \Psi }_{ w }={ \Psi }_{ s }$ . This happens because, at atmospheric pressure, there is no hydrostatic pressure on water in the cell. As a result, the value of Pressure potential is effectively zero. Subsequently making water potential equal to solute potential. As we know, Water potential = solute potential + pressure potential, but pressure potential is equal to zero. Hence,

Ψ_{w} = Ψ_{s}

${ \Psi }_{ w }={ \Psi }_{ s }$ .

So, the correct option is '

Ψ_{w} = Ψ_{s}

${ \Psi }_{ w }={ \Psi }_{ s }$ '.

Recognize the figure and find out the correct statement.
(i) The solution of which chamber has a lower water potential?
(ii)The solution of which chamber has a lower solute potential?
(iii) In which direction osmosis occurs?
(iv) At equilibrium which chamber will have lower water potential?

0%
(i)-A, (ii)-B, (iii)-A to B, (iv)-A
0%
(i)-B, (ii)-A, (iii)- A to B, (iv)-Same
0%
(i)-B, (ii)-B, (iii)-A to B, (iv) -same
0%
(i)-A, (ii)-A, (iii)-B to A, (iv) same

Arrange the following in ascending order based on their solute concentration

Cell	Water Potential (KPa)	Pressure Potential (KPa)
(a)	-590	320
(b)	-368	623
(c)	-292	412
(d)	-481	146

0%
a, a, d, b
0%
d, c, a, b
0%
a, c, b, d
0%
b, a, c, d

X and Y are two living cells adjacent to each other. The cell X has solute potential

(Ψ_{s})

$( \Psi_s )$ of -9 bars and pressure potential

(Ψ_{p})

$( \Psi_p )$ of 4 bars whereas cell Y has solute potential

(Ψ_{s})

$( \Psi_s )$ of -8 bars and pressure potential

(Ψ_{p})

$( \Psi_p )$ of 5 bars. What will be the direction of water movement between these cells?

0%
Cell X to cell Y
0%
Cell Y to cell X
0%
Does not move in any direction
0%
Moves in both directions

The given table shows properties of four cells systems A, B, C and D. The maximum rate of inward diffusion of water will be observed in which of these systems?

System	Intracellular concentration of water	Extracellular concentration of water
A	0.09 M	0.11 M
B	0.2 M	0.5 M
C	0.05 M	0.6 M
D	0.03 M	0.7 M

0%
System A
0%
System B
0%
System C
0%
System D

When transport proteins simultaneously move two molecules across a membrane in the same direction, the process is called

0%
Uniport
0%
Antiport
0%
Symport
0%
Diffusive port

If cell A with OP = 5 and TP = 4 is surrounded by cells with OP = 3 and TP = 1, what will be the direction of water movement?

0%
From other cells to cell A
0%
From cell A to other cells
0%
Water will not move
0%
Data insufficient

Water in adjacent xylem moves into the phloem by process of :

0%
Simple diffusion
0%
Active transport
0%
Osmosis
0%
Facilitated diffusion

The given diagram shows a potato plant forming new tubers. Which route would be taken by most of the food at this time?

0%
$1 \rightarrow 4 \rightarrow 2 \rightarrow 3$
0%
$6 \rightarrow 5 \rightarrow 2 \rightarrow 3$
0%
$1 \rightarrow 4 \rightarrow 5 \rightarrow 6$
0%
$6 \rightarrow 5 \rightarrow 4 \rightarrow 1$

By which mechanism, the salt resistant plants get rid off excess

N a^{+}

$Na^+$ ions to the outer side through the roots.

0%
$H^+ -$ ATPase uniport system
0%
$Na^+ -$ uniport system
0%
$H^+ - Cl^-$ symport system
0%
$Na^+ - H^+$ antiport system.

What would be the

Ψ_{p}

$\Psi_p$ of a flaccid cell?

0%
Positive
0%
Negative
0%
Zero
0%
Cannot be determined

0.5 M Sucrose solution develops a pressure of

15

$15$ bars in an osmometer. Which of the following statement is WRONG for such a solution?

0%
That its osmotic potential is $-15$ bars
0%
That its water potential is $-15$ bars
0%
That its pressure potential is $-15$ bars
0%
That its osmotic pressure is $+15$ bars

Which one is true about guttation?

0%
It occurs through specialised pores called hydathodes.
0%
It occurs in herbaceous plants when root pressure is low and transpiration is high.
0%
It only occurs during the day time.
0%
It occurs in plants growing under conditions of low soil moisture and high humidity.

The function of Anti-transpirants is:

0%
Reduce the rate of transpiration without affecting carbon assimilation
0%
Reduce the rate of transpiration affecting carbon assimilation
0%
Reduce the rate of transpiration affecting growth of plant
0%
Reduce the rate of transpiration affecting protein synthesis of plant

The main significance of facilitated diffusion is

0%
Excretion of urea and hydrogen ions by mammalian kidneys
0%
Absorption of amino acids from the gut
0%
Absorption of mineral ions by plant roots
0%
Absorption of fructose and nucleotides in the small intestine

What is the direction of net osmotic movement of water of a solution $A$ enclosed in a semipermeable membrane having an osmotic potential $-30$ bars and pressure potential $5$ bars is surrounded in a solution $B$ of osmotic potential $-10$ bars and pressure potential $= 0?$

0%
$A \rightarrow B$
0%
$B \rightarrow A$
0%
No movement
0%
Equal amount

Which is used to measure the rate of transpiration?

0%
Atmometer
0%
Psychrometer
0%
Potometer
0%
Porometer

In this diagram when the O.P. of the cell

B

$B$ increases to

18

$18$ , what would be changes with regard to water movement?

0%
Cells $A, C, D$ and $E$ absorb water from $B$
0%
Water diffuses $B$ from outer cell
0%
No movement of water will occur
0%
$B$ absorb of water will occur

At incipient plasmolysis, water potential

(ψ_{w})

$(\psi_w)$ is equal to?

0%
$\psi_z+\psi_p$
0%
$\psi_s$
0%
$\psi_s+\psi_p+\psi_m$
0%
$\psi_p+\psi_m$

Select the possible path of water movement from the given hypothetical arrangement of cells

0%
$\qquad A\rightarrow B\rightarrow C$ `
0%
$\qquad C\rightarrow A\rightarrow B$
0%
$\qquad C\rightarrow B\rightarrow A$
0%
$\qquad B\rightarrow A\rightarrow C$

In the given diagram if TP of cell 'B' increases to

18

$18$ . What would be the net direction of water moment?

0%
A to B and B to E
0%
E to B and A
0%
B to E and A to E
0%
B to E and A

Two cells A and B are adjacent to each other. The cell A has osmotic pressure 13 atm and turgor pressure 5 atm, while the cell B has osmotic pressure 6 atm and turgor pressure 2 atm. the result will be

0%
Movement of water from cell A to B
0%
Movement of water from cell B to A
0%
Equilibrium of water transport between cell A and B
0%
No movement of water at all

The value of

ψ

$\psi$ S is always?

0%
Positive for pure water
0%
Less for pure water as compared to any solution
0%
Negative for cell sap
0%
Positive for any solution

Read the following statements:
Apoplast is a system of interconnected protoplasts
Symplastic movement may be aided by cytoplasmic streaming

0%
Only (2) is correct
0%
Both (1) and (2) are incorrect
0%
Only (1) is correct
0%
Both (1) and (2) are correct

CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 16 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

Cell	water potential	Pressure potential	Solute potential (water potential - pressure potential)
a	-590	320	-910
b	-368	623	-991
c	-292	412	-704
d	-481	146	-627

CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 16 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

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