Cell $A$ has osmotic potential of - $18$ bars and
Question:

Cell AA has osmotic potential of - 1818 bars and pressure potential of 88 bars, whereas, cell BB has osmotic potential of - 1414 bars and pressure potential 22 bars. The direction of flow of water will be

Updated On: Jul 28, 2022
  • from cell B to cell A
  • from cell A to cell B
  • no flow of water
  • in both the directions
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The Correct Option is B

Solution and Explanation

The water potential (ψ)(\psi) is equal to osmotic potential (ψs)+\left(\psi_{ s }\right)+ presure potential (ψp)\left(\psi_{ p }\right). Osmotic potential is always in negative value. The water potential is the chemical potential of water, which is equivalent to DPD with negative sign. Therefore, water potential (ψA)\left(\psi_{ A }\right) of cell A=ψA=ψs+ψp=18+8=10A =\psi_{ A }=\psi_{ s }+\psi_{ p }=-18+8=-10 water potential of cell B(ψB)=ψB=ψs+ψp=14+2=12B \left(\psi_{ B }\right)=\psi_{B}=\psi_{s}+\psi_{p}=-14+2=-12 Since, water moves from higher water potential to lower potential, the flow of water will be from cell AA (-1010 bars) to cell BB (- 1212 bars).
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Concepts Used:

Osmosis

Osmosis is a passive process and happens without any expenditure of energy. It involves the movement of molecules from a region of higher concentration to lower concentration until the concentrations become equal on either side of the membrane.

There are three different types of solutions:

  • Isotonic Solution is one that has the same concentration of solutes both inside and outside the cell.
  • Hypertonic solution is one that has a higher solute concentration outside the cell than inside.
  • Hypotonic solution is one that has a higher solute concentration inside the cell than outside.