Tag: diffusion pressure deficit

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

Find out the incorrect about diffusion pressure(DP)
I. DP $\alpha$ Conc. of solution
II. DP $=$ DP
III. For a fully turgid cell, DP$=0$.

  1. I and II only

  2. II & III only

  3. I & III only

  4. I, II and III
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diffusion Pressure (DP) is inversely proportional to the concentration of the solute (as solute concentration increases, DP decreases). Statement II is a tautology (DP=DP), and statement III is incorrect because in a fully turgid cell, DPD is zero, but DP is at its maximum (equal to the DP of pure water).

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

When a cell is placed in water, it takes in water due to

  1. Osmotic pressure

  2. Suction pressure

  3. Translocation

  4. Water potential and TP
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

'Diffusion pressure deficit' (DPD) is also known as suction pressure (SP). DPD is responsible for movement of water in a plant. Water moves from a region or cell of low DPD to a cell or region of high DPD. The DPD is calculated as the difference of osmotic pressure (which is responsible for entry of water into a cell) and turgor pressure (which opposes entry of water into a cell). 

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

Water enters from the soil into the root hairs due to

  1. Turgor pressure of root hair

  2. Osmotic pressure of root hair

  3. Suction pressure

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

Suction pressure is same as DPD (Diffusion Pressure Deficit). Water moves in a plant due to suction pressure or DPD from a region of lower DPD to a region of higher DPD.

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

The term diffusion pressure deficit was coined by 

  1. De Duve

  2. B.S Meyer

  3. Novikoff

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

The term diffusion pressure deficit (DPD) was coined by B.S Meyer in 1938. 

The amount by which diffusion pressure of a solution is lower than its pure solvent is known as Diffusion Pressure Deficit. DPD of pure water is the lowest. Hence option B is correct.

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

Osmotic pressure of a cell is zero, when

  1. T.P. is maximum

  2. DPD is maximum

  3. T.P. is zero

  4. Not possible
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Osmotic pressure is the pressure responsible for osmosis in the plant. Osmotic pressure depends on the concentration of solute particles in the cell sap. More the concentration of solute particles more the osmotic pressure. The osmotic pressure of cell sap can never be zero, because always there will be some or the other solute particles present in the cell sap. 

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

The real force responsible for the movement of water from cell to cell is

  1. OP

  2. TP

  3. DPD

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

DPD stands for diffusion pressure deficit. The deficit in diffusion pressure depends on the number of solute particles present in the system. In a plant body, water moves from a region of low DPD to a region of high DPD. This is understandable because low DPD means low solute concentration or high concentration of solvent molecules and vice versa for high DPD.

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

The term "DPD" was coined by

  1. Renner

  2. Kramer

  3. B. S. Mayer

  4. Stephen Hales
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The amount by which the diffusion pressure of a solution is lower than that of the pure solvent is called as 'diffusion pressure deficit' (DPD). The term diffusion pressure deficit (DPD) was coined by B.S Meyer in 1938. Originally DPD was described as suction pressure by Renner (1915).

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

If the given solution is of 25% concentration; then what cannot be presented for this

  1. OP

  2. DPD

  3. Solute potential

  4. TP
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a cell is immersed in water, then water enter into the cell because the osmotic pressure of the cell sap is higher. The cell content develops a pressure against the cell wall, which is called turgor pressure. If the given solution is of 25% concentration; then it can not represent TP(turgor pressure) because pressure cannot be expressed in terms of concentration.

So, the correct answer is 'TP'.