Tag: transport in plants

Questions Related to transport in plants

Which of the relations is correct

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

  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. $\Psi w=\Psi s+ \Psi s+\Psi p$

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Correct Option: A

The water potential of imbibants is:

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

  1. HIghly positive

  2. Zero

  3. Highly negative

  4. Always positive

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Correct Option: C
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'.

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

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

  1. Decreases

  2. increase

  3. first increase then decrease

  4. No change

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Correct Option: A
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'.

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


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

  1. a, b and c

  2. a and b

  3. a, b, c and d

  4. a and d

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Correct Option: A

Water potential in a cell

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

  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

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Correct Option: A

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 ______________.

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

  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

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Correct Option: C

The movement of water into and out of cells is controlled by

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

  1. Water potential

  2. Endosmosis

  3. Exosmosis

  4. Plasmolysis

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Correct Option: A

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

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

  1. No effect

  2. Increase

  3. Decrease

  4. Firstly increase then decrease

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Correct Option: A

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

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

  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

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Correct Option: C
Explanation:

The pressure potential is usually positive.

So the incorrect option is C.

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.

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

  1. I only

  2. II only

  3. Both (I) & (II)

  4. Neither (I) nor (III)

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Correct Option: A