Tag: transport in plants

Quizzes (25) Questions (112)

Questions Related to transport in plants

Multiple choice water potential water potential and pressure plant water relation transport in plants biology

Which of the relations is correct

  1. $\Psi s=\Psi p+\Psi w$
  2. $\Psi p=\Psi m+\Psi w+\Psi s$
  3. $\Psi w=\Psi m+\Psi p+\Psi s$
  4. $\Psi w=\Psi s+ \Psi s+\Psi p$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water potential (Psi_w) is correctly expressed as the sum of its components: matric potential (Psi_m), pressure potential (Psi_p), and solute potential (Psi_s), which corresponds to option C.

Multiple choice water potential water potential and pressure plant water relation transport in plants biology

The water potential of imbibants is:

  1. HIghly positive

  2. Zero

  3. Highly negative

  4. Always positive
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • The absorption of water by the solid particles of an adsorbent without forming a solution is called Imbibition.
  • Imbibants have very high negative water potential. It is called the matric potential. Water has (the highest) maximum water potential (maximum being zero).

So, the correct option is 'Highly negative'.

Multiple choice water potential water potential and pressure plant water relation transport in plants biology

Water potential of a cell when it is placed in hypertonic solution:-

  1. Decreases

  2. increase

  3. first increase then decrease

  4. No change
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pure water (i.e. water with no solutes) has a water potential value of 0. As you add solutes (i.e. sugar or salt) to water, the water potential value is lowered. This, therefore, means that the water potential value for any solution is always negative (as the value is lowered from the starting value of 0). Higher the concentration, lower is water potential.

A hypertonic solution has a higher solute concentration and a lower solvent concentration than the cell – hence water molecules would move out of the cell through osmosis. In this case, as water is leaving cells and concentration is increasing in cell water potential will decrease.
So, the correct option is 'Decreases'.

Multiple choice water potential water potential and pressure plant water relation transport in plants biology

Select the correct statements w.r.t water potential 
(a) the greater the concentration of water in a system the greater is its Kinetic energy 
(b)water will move from high $\Psi _w to low \Psi _w$
(c)process of movement of substance down a gradients of free energy is called diffusion
(d)Solution has fewer free water and thus its water potential is less


  1. a, b and c

  2. a and b

  3. a, b, c and d

  4. a and d
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice water potential water potential and pressure plant water relation transport in plants biology

Water potential in a cell

  1. is always zero

  2. Depends upon solute and pressure potentials

  3. Is positive in a cell with high solute concentration

  4. Do not regulate the movement of water molecules from one cell to another
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The water potential of a plant cell is determined by the combined effects of solute concentration (solute potential) and turgor pressure (pressure potential).

Multiple choice water potential water potential and pressure plant water relation transport in plants biology

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 $\psi _p$ = 8 bars. Then ______________.

  1. Water moves from cell A to cell B

  2. There is no movement of water between cell A and cell B

  3. Water moves from cell B to cell A

  4. Equal amount of water is simultaneously exchanged between cell A and cell B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water potential (Psi_w) = Psi_s + Psi_p. For cell A: -20 + 8 = -12 bars. For cell B: -12 + 8 = -4 bars. Water moves from higher potential (-4) to lower potential (-12), so from B to A.

Multiple choice water potential water potential and pressure plant water relation transport in plants biology

What is the effect on the value of DPD when the water potential of that cell is increased :-

  1. No effect

  2. Increase

  3. Decrease

  4. Firstly increase then decrease
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diffusion Pressure Deficit (DPD) is inversely related to water potential (DPD = -Psi_w for standard solutions without external pressure). Therefore, when the water potential of a cell increases, its DPD decreases.

Multiple choice water potential water potential and pressure plant water relation transport in plants biology

0.5 M sucrose develops a pressure of 15 bars  in an osmometer. Which of the following statement is wrong for such a solution ______________.

  1. That its osmotic potential is-15 bars

  2. That its water potential is-15 bars

  3. That its pressure potential is-15 bars

  4. That its osmotic potential is+15 bars
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pressure potential is usually positive.

So the incorrect option is C.

Multiple choice water potential water potential and pressure plant water relation transport in plants biology

Pick the CORRECT statement(s) in the following.
I. Increase in solute potential of a solution increases its water potential.
II. Water potential of pure water is taken as zero.

  1. I only

  2. II only

  3. Both (I) & (II)

  4. Neither (I) nor (III)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement I is correct because increasing solute potential (making it less negative or adding positive increments) increases water potential. Statement II is correct because pure water at standard temperature and pressure has a water potential defined as zero.