Tag: diffusion pressure deficit

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Questions Related to diffusion pressure deficit

Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

In a fully turgid cell, the values of DPD, OP and TP will show the tendency

  1. DPD$=$10atm, OP$=$15atm, TP$=$5atm
  2. DPD$=$5atm, OP$=$12atm, TP$=$7atm
  3. DPD$=$2atm, OP$=$7atm, TP$=$5atm
  4. DPD$=$0atm, OP$=$15atm, TP$=$15atm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In a fully turgid cell there will be no net movement of water. Neither water will move inside nor move outside. This is because DPD will be zero. DPD can be zero, when the osmotic pressure, which causes movement of water inside the cell equals to turgor pressure, which opposes the entry of water inside the cell.

Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

When the mesophyll cells lose water, their DPD will

  1. Increase

  2. Decrease

  3. Remain constant

  4. None of the above is applicable
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the mesophyll cells lose water the concentration of solutes will increase. Consequently, the OP will increase concomitantly, there will be a drop in turgor and TP will decrease. These changes will increase the DPD. Water moves from lower DPD to higher DPD, thus, water will gain entry into the cells, whose DPD has increased.

Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

A and B cells are contiguous. Cell $1$ has OP$=10$ atm. TP=$7$ atm and DPD$=3$ atm. Cell $2$ has OP $=8$atm, TP$=3$ atm and DPD$=5$ atm. The result would be __________________.

  1. No movement of water

  2. Equilibrium between the two
  3. Movement of water from $1$ to $2$
  4. Movement of water from $2$ to $1$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water moves from a region of lower DPD to a region of higher DPD. Cell 1 has a DPD of 3 atm and Cell 2 has a DPD of 5 atm; therefore, water moves from Cell 1 to Cell 2.

Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

A plasmolysed cell placed in hypotonic solution then the water enter in it, the force which is responsible for it is __________.

  1. DPD

  2. OP

  3. WP

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is option B i.e. "OP"
Hypotonic solution is one in which the solution kept outside the cell has lower solute concentration than the fluid inside the cell. The process being investigated is osmosis. Osmosis is the diffusion of water molecules across a semi-permeable membrane from a more dilute solution (with a lower solute concentration) to a less dilute solution (with a higher solute concentration). Therefore cell absorbs or sucks water with a force equal to O.P

Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

In a plant cell the diffusion pressure deficit is zero when it is 

  1. Plasmolysed.

  2. Turgid.

  3. Flaccid.

  4. Incipient.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diffusion Pressure Deficit = osmotic pressure - wall pressure. Wall pressure is the same as Turgor pressure. When a cell is placed in a hypotonic solution water enters the cell. Hence its osmotic pressure decreases and the turgor pressure increases. In a fully turgid cell the turgor pressure becomes equal to the osmotic pressure. Hence the Diffusion Pressure Deficit becomes zero in a turgid cell. Thus the correct answer is option B.

Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

The force which determines the flow of water from one cell to another is

  1. T.P.

  2. D.P.D

  3. O.P.

  4. W.P.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The force which determines the flow of water from one cell to another is diffusion pressure deficit. Diffusion pressure deficit (DPD) is the amount by which two solutions differ in their diffusion pressure. It is defined as the amount by which the diffusion pressure of water or solvent in a solution is lower than that of pure water or solvent. It allows easy absorption of water due to diffusion pressure gradient. Water moves from lower DPD to higher DPD.
So, the correct answer is option B.
Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

Root hair absorb water from soil due to

  1. Osmotic pressure

  2. Turgor pressure

  3. Suction pressure

  4. Root pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Suction pressure is the decrease in the diffusion pressure of solution over its pure state due to the presence of solute particles in it. The concentration of solute is higher in root hair cells as compared to soil water. So suction pressure builds up and water is drawn towards root hair cells. These water molecules are transported to different parts of the plant. So, the correct answer is 'Suction pressure'.

Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

DPD is abbreviated form of

  1. Daily photosynthetic deficit

  2. Daily phosphorus deficit

  3. Daily pressure deficit

  4. Diffusion pressure deficit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Diffusion pressure deficit (DPD) is the amount by which two solutions differ in their diffusion pressure. The amount by which the diffusion pressure of water or solvent in a solution is lower than that of pure water or solvent is known as diffusion pressure deficit. It allows easy absorption of water due to diffusion pressure gradient. Water moves from lower DPD to higher DPD.
So, the correct answer is option D.
Multiple choice botany plant water relation diffusion pressure deficit other pressure components osmosis in plants

The movement of water is along the 

  1. Turgor gradient

  2. DPD gradient

  3. Diffusion gradient

  4. Osmotic gradient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DPD is the diffusion pressure deficit. When a cell is put in a hypertonic solution (solution with the high concentration of solutes than the solute concentration ), a water potential or DPD gradient is created between the cell and the external solution. Hence the water diffuses out of the cell; the process is called exosmosis. Thus water movement is due to DPD gradient not because of turgor gradient, diffusion gradient and osmotic gradient.