Tag: plant water relation

Quizzes (6) Questions (146)

Questions Related to plant water relation

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

The water potential is?

  1. Equal in soil and atmosphere

  2. Lowest in soil and highest in atmosphere

  3. Highest in soil and lowest in atmosphere

  4. Non-existent at both the places
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water potential is highest in pure water or wet soil (around 0 MPa or slightly negative) and decreases along the soil-plant-atmosphere continuum, reaching its lowest values in dry atmospheric air to drive transpiration.

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

If the solute is added in the given solution than what observation can be made?

  1. Its DPD decreases

  2. It's water potential decreases

  3. DPD & water potential remains unchanged

  4. Its water potential increases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Adding solute to a solution increases the solute concentration, which lowers its solute potential (makes it more negative) and consequently decreases the overall water potential of the solution.

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).