The Question is from neet-botany plant-physiology plant-water-relations, and it was created by the author B VENKAT

Question

A plant cell with a water potential of -0.6 MPa is placed in a solution with a water potential of -0.8 MPa.  Which of the following will occur?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Water potential and osmosis in plant cells
 **Related Topics**: Plasmolysis, turgor pressure, water movement across membranes
 **Prerequisites**: Understanding of water potential, osmosis, and the effects of hypertonic and hypotonic solutions on plant cells.
## SOLUTION PATHWAY
**Given Information**:
  Plant cell water potential ($\Psi_{cell}$) = -0.6 MPa
  Solution water potential ($\Psi_{solution}$) = -0.8 MPa
  [Important conditions]: The solution has a lower water potential than the cell.
**Method & Steps**:
 1. Compare the water potentials:
  Reasoning: Water moves from a region of higher water potential to a region of lower water potential.
  Formula/Rule: Water movement is driven by the water potential gradient ($\Delta\Psi = \Psi_{cell} - \Psi_{solution}$)
 2. Determine the direction of water movement:
  Working: $\Delta\Psi = -0.6 MPa - (-0.8 MPa) = +0.2 MPa$. Since $\Delta\Psi$ is positive, water will move from the cell (higher water potential) to the solution (lower water potential).
  Key Point: A positive $\Delta\Psi$ indicates water movement out of the cell.
 3. Identify the consequence of water loss:
  Result: Water loss from the cell will cause the cell membrane to pull away from the cell wall, a process known as plasmolysis.
  Verification: The given conditions and the principles of osmosis support the conclusion.
 ## OPTION ANALYSIS
A ✓: Water will move out of the cell, causing plasmolysis. [Correct: This accurately describes the outcome of placing a cell in a hypertonic solution.]
B :x: Water will move into the cell, causing turgor pressure to increase. [Incorrect: Water moves from higher to lower water potential, opposite to what is stated.]
C :x: There will be no net movement of water. [Incorrect: There's a water potential gradient, leading to water movement.]
D :x: The cell will burst due to excessive water uptake. [Incorrect: This would only occur if the cell were placed in a hypotonic solution.]
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the direction of water movement: Remember water moves from higher to lower water potential.
  2.Misinterpreting the effect of hypertonic and hypotonic solutions on plant cells.
 **Quick Tips**:
  1. Use the water potential gradient ($\Delta\Psi$) to determine the direction of water movement.
  2. Remember that plasmolysis occurs in hypertonic solutions, while turgor pressure increases in hypotonic solutions.

B VENKAT · Answer

The correct Option is "Water will move out of the cell, causing plasmolysis."

B VENKAT · Answer

Water will move into the cell, causing turgor pressure to increase.

B VENKAT · Answer

There will be no net movement of water.

B VENKAT · Answer

The cell will burst due to excessive water uptake.

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