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

What happens when the concentration of solutes decrease in the guard cells?
  • Water potential decreases
  • Water potential increases
  • Osmotic potential increases
  • None of the above
Apoplast is the system of adjacent cell walls that is continuous throughout the plant except at the 
  • Plasmodesmata
  • Vessel element
  • Casparian strips of endodermis
  • Tracheids
The correct ascending sequence with respect to their water potential is

(a) $$ \pi = -0.8 \text{MPa}, P = +0.4 \text{MPa}$$
(b) $$ \pi = -1.0 \text{MPa}, P = +0.5 \text{MPa}$$
(c) $$ \pi = -0.9 \text{MPa}, P = +0.2 \text{MPa}$$
(d) $$ \pi = -0.3 \text{MPa}, P = +0.2 \text{MPa}$$
  • a, b, c, d
  • c, b, a, d
  • c, a, b, d
  • c, d, b, a
During its life, a potato plant transpires water
  • 30 litres
  • 90 litres
  • 155 litres
  • 245 litres
Value of osmotic potential $$ ( \pi ) $$ and pressure potential (p) of cells a, b, c, d are given: 
Cell$$ \pi $$p
a1.00.5
b0.60.3 
c1.20.6
d0.80.4
Identify the correct sequence for movement of water.
  • b $$ \longrightarrow $$ c $$ \longrightarrow $$ d $$ \longrightarrow $$ a
  • c $$ \longrightarrow $$ b $$ \longrightarrow $$ a $$ \longrightarrow $$ d
  • d $$ \longrightarrow $$ c $$ \longrightarrow $$ a $$ \longrightarrow $$ b
  • b $$ \longrightarrow $$ d $$ \longrightarrow $$ a $$ \longrightarrow $$ c
Components of water potential of four cells of an actively transpiring monocot plant are
CellOsmotic Potential Pressure Potential 
a-0.90.5
b-0.80,6
c-0.60.1
d-0.70.4
Identify the four cells as root hair, cortical cell, epidermal and pericycle cells.
  • b, c, d, a
  • b, d, c, a
  • b, d, a, c
  • a, d, b, c
Water potential in closely placed cell (p, q, r) is given below. Find out correct direction of water movement : 
CellOsmotic Potential
(MPa)		Pressure potential
p-0.210.05
q-0.220.02
r-0.230..05
(a) p $$\longrightarrow $$ q
(b) q $$\longrightarrow $$ r
(c) r $$\longrightarrow $$ p
(d) r $$\longrightarrow $$ q
  • a, b
  • b, c
  • a, d
  • b, d
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 a to cell b.
  • There is no movement of water between cell a and cell b.
  • Water moves from cell b to cell a.
  • Equal amount of water is simultaneously exchanged between cell a and cell b.
Which is incorrect?
  • $$ \Psi_w = \Psi_\pi + \Psi_p $$
  • $$ \Psi_w = \Psi_m \Psi_\pi + \Psi_p $$
  • $$ \Psi_w = \Psi_s + \Psi_p $$
  • $$ \Psi_w = \Psi_m + \Psi_\pi + \Psi_p $$
Guttation is the release of liquid water from veins at the leaf margins. It is caused by
  • Transpiration
  • High leaf pressure
  • High root pressure
  • 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).
  • Apoplast
  • Symplast
  • Transmembrane
  • Both (a) and (c)
The value of water potential $${ \Psi  }_{ w }$$ for a solution at atmospheric pressure is :-
  • $${ \Psi }_{ w }={ \Psi }_{ s }$$
  • $${ \Psi }_{ w }=zero$$
  • $${ \Psi }_{ w }=-{ \Psi }_{ s }$$
  • $${ \Psi }_{ w }={ \Psi }_{ s }+{ \Psi }_{ p }$$
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?

693303_bf3dbb9483f148aa88a2dc6c40c55f1b.jpg
  • (i)-A, (ii)-B, (iii)-A to B, (iv)-A
  • (i)-B, (ii)-A, (iii)- A to B, (iv)-Same
  • (i)-B, (ii)-B, (iii)-A to B, (iv) -same
  • (i)-A, (ii)-A, (iii)-B to A, (iv) same
Arrange the following in ascending order based on their solute concentration 

CellWater Potential
(KPa)		Pressure Potential 
(KPa)
(a)-590320
(b)-368623
(c)-292412
(d)-481146
  • a, a, d, b
  • d, c, a, b
  • a, c, b, d
  • b, a, c, d
X and Y are two living cells adjacent to each other. The cell X has solute potential $$ ( \Psi_s ) $$ of -9 bars and pressure potential $$ ( \Psi_p ) $$ of 4 bars whereas cell Y has solute potential $$ ( \Psi_s ) $$ of -8 bars and pressure potential $$ ( \Psi_p ) $$ of 5 bars. What will be the direction of water movement between these cells?
  • Cell X to cell Y
  • Cell Y to cell X
  • Does not move in any direction
  • 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?
SystemIntracellular
concentration
of water 		Extracellular
concentration 
of water
A0.09 M0.11 M
B0.2 M0.5 M
C0.05 M0.6 M
D0.03 M0.7 M
  • System A
  • System B
  • System C
  • System D
When transport proteins simultaneously move two molecules across a membrane in the same direction, the process is called
  • Uniport
  • Antiport
  • Symport
  • 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?
  • From other cells to cell A
  • From cell A to other cells
  • Water will not move
  • Data insufficient
Water in adjacent xylem moves into the phloem by process of :
  • Simple diffusion
  • Active transport
  • Osmosis
  • 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?

886092_1e090a4c6dde46769e7d8b27b9e429ff.png
  • $$1 \rightarrow 4 \rightarrow 2 \rightarrow 3$$
  • $$6 \rightarrow 5 \rightarrow 2 \rightarrow 3$$
  • $$1 \rightarrow 4 \rightarrow 5 \rightarrow 6$$
  • $$6 \rightarrow 5 \rightarrow 4 \rightarrow 1$$
By which mechanism, the salt resistant plants get rid off excess $$Na^+$$ ions to the outer side through the roots.
  • $$H^+ -$$ ATPase uniport system
  • $$Na^+ -$$ uniport system
  • $$H^+ - Cl^-$$ symport system
  • $$Na^+ - H^+$$ antiport system.
What would be the $$\Psi_p$$ of a flaccid cell?
  • Positive
  • Negative
  • Zero
  • Cannot be determined
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 osmotic potential is $$-15$$ bars
  • That its water potential is $$-15$$ bars
  • That its pressure potential is $$-15$$ bars
  • That its osmotic pressure is $$+15$$ bars
Which one is true about guttation?
  • It occurs through specialised pores called hydathodes.
  • It occurs in herbaceous plants when root pressure is low and transpiration is high.
  • It only occurs during the day time.
  • It occurs in plants growing under conditions of low soil moisture and high humidity.
The function of Anti-transpirants is:
  • Reduce the rate of transpiration without affecting carbon assimilation
  • Reduce the rate of transpiration affecting carbon assimilation
  • Reduce the rate of transpiration affecting growth of plant
  • Reduce the rate of transpiration affecting protein synthesis of plant
The main significance of facilitated diffusion is
  • Excretion of urea and hydrogen ions by mammalian kidneys
  • Absorption of amino acids from the gut
  • Absorption of mineral ions by plant roots
  • 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$$= 0?$$
  • $$A \rightarrow B $$
  • $$B \rightarrow A$$
  • No movement
  • Equal amount
Which is used to measure the rate of transpiration?
  • Atmometer
  • Psychrometer
  • Potometer
  • Porometer
In this diagram when the O.P. of the cell $$B$$ increases to $$18$$ , what would be changes with regard to water movement?
1084142_e6642b34323d49bfbee7caf47488da6d.PNG
  • 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
At incipient plasmolysis, water potential $$(\psi_w)$$ is equal to?
  • $$\psi_z+\psi_p$$
  • $$\psi_s$$
  • $$\psi_s+\psi_p+\psi_m$$
  • $$\psi_p+\psi_m$$
Select the possible path of water movement from the given hypothetical arrangement of cells 
1476621_505b0b9ba2aa49b0b809a8381e738687.PNG
  • $$\qquad A\rightarrow B\rightarrow C$$`
  • $$\qquad C\rightarrow A\rightarrow B$$
  • $$\qquad C\rightarrow B\rightarrow A$$
  • $$\qquad B\rightarrow A\rightarrow C$$
In the given diagram if TP of cell 'B' increases to $$18$$. What would be the net direction of water moment?
1333301_a8914d5192c34fa19ab1232db3bf2212.jpg
  • A to B and B to E
  • E to B and A
  • B to E and A to E
  • 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 
  • Movement of water from cell A to B
  • Movement of water from cell B to A
  • Equilibrium of water transport between cell A and B
  • No movement of water at all
The value of $$\psi$$S is always?
  • Positive for pure water
  • Less for pure water as compared to any solution
  • Negative for cell sap
  • Positive for any solution
Read the following statements:
Apoplast is a system of interconnected protoplasts
Symplastic movement may be aided by cytoplasmic streaming
  • Only (2) is correct
  • Both (1) and (2) are incorrect
  • Only (1) is correct
  • Both (1) and (2) are correct
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