Tag: plant water relation
Questions Related to plant water relation
DPD is abbreviated form of
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Daily photosynthetic deficit
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Daily phosphorus deficit
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Daily pressure deficit
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Diffusion pressure deficit
The movement of water is along the
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Turgor gradient
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DPD gradient
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Diffusion gradient
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Osmotic gradient
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.
A cell with DPD=5 is surrounded by A,B,C and D cell having OP and Tp respectively 5 and 4, 7 and 5, 3 and 2, 0.5 and 0. From which cell it will withdraw water fast?
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D
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C
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B
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A
DPD is the difference between Osmotic pressure and Turgor pressure.
Which of the following is correct about DPD?
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DPD is the reduction in diffusion pressure of solvent in a system over its pure state
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DPD = OP - TP
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DPD is zero, entry of water will stop
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All of the above
DPD is diffusion pressure deficit. It is the reduction in the diffusion pressure of solvent in a system over its pure state due to presence of solutes in it and forces opposing diffusion. Pure solvent has the maximum diffusion pressure. DPD is the difference between the osmotic pressure (OP) and turgor pressure (TP). When a cell is turgid, its OP is equal to TP and DPD is zero. When DPD is zero, the entry of water will stop as turgid cell cannot absorb any more water.
Which of the following is not correct about DPD?
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It is the loss of diffusion pressure
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Maximum value of DPD is equal to OP
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DPD of pure water is zero
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Low DPD means small gap between the value of OP and TP
DPD or diffusion pressure deficit is the difference between the diffusion pressure of a solution and a pure solvent when both are subjected to the same atmospheric pressure. Since pure water does not contain any solute particles, therefore it has zero DPD. Movement of water is always from low DPD to high DPD. When increasing turgor pressure becomes equal to decreasing osmotic pressure, the entry of water into the cell would stop.
Which option is true for a fully turgid cell?
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OP $=$ DPD
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OP $=$ zero
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DPD $=$ Zero
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TP $=$ Zero
As the cell becomes fully turgid, the value of turgor pressure becomes
equal to that of solute potential $(\Psi _s)$ so that water potential
$(\Psi _w)$ or DPD becomes either zero or equal to that of external
hypotonic solution.
$\Psi _w=\Psi _s+\Psi _p=0$
Which of the following equations is correct in respect of osmotic phenomenon ?
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DPD = OP - TP
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DPD = OP + TP
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DPD = OP $\times$ TP
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DPD = OP $\div$ TP
DPD = Diffusion pressure deficit
If DPD represents diffusion pressure deficit, OP is the osmotic pressure and TP is the turgor pressure, then which of the following equations is correct?
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DPD $=$ OP $=$ TP
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DPD $=$ OP $+$ TP
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DPD $=$ OP $-$ TP
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DPD $=$ OP
The reduction in the diffusion pressure of water in a solution over its
pure state is called diffusion pressure deficit or DPD. Diffusion
pressure deficit is also called suction pressure. It value is equal to
the osmotic pressure or potential (OP) (positive value taken in bars or
atm) of the solution in a cell or system minus the wall pressure (WP)
($=$ turgor pressure, TP) which opposes the entry of water into it
provided the external water is pure DPD $=$ OP $-$ WP ($=$TP)
Water moves from a cell with __________ DPD to a cell with ________ DPD.
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Higher, Lower
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Lower, higher
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Lower, lower
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Higher, higher
DPD (diffusion pressure deficit) opposes the diffusion process. so from that we conclude that water moves from a cell with lower DPD to a cell with higher DPD.
Correct option is B.
When a plasmolysed cell is placed in a hypotonic solution then water will move inside the cell this will happen due to which force?
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Diffusion Pressure Deficit
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Osmotic Pressure
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Wall Pressure
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None of the above