Tag: plant water relation

Questions Related to plant water relation

The water potential is?

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

  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

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Correct Option: A

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

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

  1. Its DPD decreases

  2. It's water potential decreases

  3. DPD & water potential remains unchanged

  4. Its water potential increases

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Correct Option: A

If some solute is dissolved in pure water, its water potential

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

  1. remains same

  2. increases

  3. decreases

  4. first decreases then increases

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Correct Option: C
Explanation:

After adding, solute in water its water potential decreases and solute potential increases.

So the correct option is "Decreases".

Amount of water, to be used in photosynthesis and plant growth, is 

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

  1. Equal to the amount of water absorbed

  2. Absorbed by active transport mainly

  3. Removed mostly by guttation in woody trees

  4. Less than 1 percent of absorbed water

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Correct Option: A

Which one is correct?

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

  1. $\Psi _m=\Psi _p+\Psi _8+\Psi _w$

  2. $\Psi _w=\Psi _p+\Psi _8+\Psi _m$

  3. $\Psi _p=\Psi _w+\Psi _m+\Psi _8$

  4. $\Psi _w=\Psi _w+\Psi _p+\Psi _p+\Psi _8$

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Correct Option: A

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