Question

$\boxed{\text{hello \: doston \:}}$


$\text{\underline{ Please explain the answer}}$

Ques---->
"Which of the following statement is correct?"

a) When value of WP is equal to the OP,then net water does not enter into the cell.


b)When the value of WP becomes greater than TP plant cell becomes flaccid.

c)Plant absorbs only one thing at a time,water or minerals.

d)Cytokinin is used as anti-transpirant.

$\textbf{{PLEASE EXPLAIN THE ANSWER}}$
(I am confused between a and b option)


Thanks❤

Answer 1

Hey mate, here's your answer^_^

Option'b'is correct as if the water potential is greater than the TP... then it's obvious that solute potential is also less than the water potential and if the solute potential is less than the amount of material which makes the cell turgid is also...so if water potential is greater than the TP or solute potential then the cell will become flaccid which means soft ...

Hope it'll help you ✌️✌️

Answer 2

When a plant cell is placed in hypotonic solution, water enters into a cell by osmosis and as a result turger pressure develops. The cell membrane get stretched and osmotic pressure of cell decreases. As cell absorbs more and more water its Total Pressure increases and Osmotic Pressure decreases. When a cell is fully turgid, its OP is equal to TP and DPD is zero. Turgid cells cannot absorb any more water. Thus, with reference to plant cell, the DPD can be described as actual thirst of cell for water and can be expressed as DPD=OP-TP.

When DPD is zero, entry of water will stop. Thus it is DPD that tends to equate and represents water absorbing ability of a cell, it is also called suction force (SF) or suction pressure (SP).

The term diffusion pressure deficit (DPD) was coined by B.S Meyer in 1938. Originally DPD was described as suction pressure by Renner (1915). It is reduction in the diffusion pressure of water in solution or cell over its pure state due to presence of solutes in it and forces opposing diffusion.

DPD of a solution is equal to its osmotic pressure i.e. DPD = OP(of solution). DPD of a cell is influence by both osmotic pressure and wall pressure (turgor pressure) which opposes the endosmotic entry of water, i.e. DPD = OP - Wall pressure. DPD is directly proportional to the concentration of the solution. DPD decreases with dilution of solution. The actual pressure with which cell absorbs water is called "suction pressure".

Osmotic Potential - The potential of water molecules to move from a hypotonic solution (more water, less solutes) to a hypertonic solution (less water, more solutes) across a semi permeable membrane.

Water potential (Symbol Ψ). The difference between the chemical potential of the water in a biological system and the chemical potential of pure water at the same temperature and pressure. It is manifested as a force acting on water molecules in a solution separated from pure water by a membrane that is permeable to water molecules only and can be expressed as the sum of the solute potential and the pressure potential: Ψ = Ψs + Ψp