The Question is from neet-botany plant-physiology , and it was created by the author K SURESH KUMAR

Question

Find the false statement.

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [B]
## CONCEPT FRAMEWORK
**Primary Concept**: Water potential and its components in plant cells.
**Related Topics**: Osmosis, turgor, plasmolysis, diffusion pressure deficit.
**Prerequisites**: Understanding of water potential, osmotic pressure, turgor pressure, and their relationships in plant cells.
## SOLUTION PATHWAY
**Given Information**:
    The question asks to identify the false statement among the given options related to plant cell water relations.
**Method & Steps**:
1.  Evaluate each statement based on the principles of plant cell water relations.
    Reasoning: Understanding the relationships between DPD, OP, TP, and water potential in different cell states.
    Formula/Rule: DPD = OP - TP;  $\psi_w = \psi_s + \psi_p$
2. Evaluate statement A: DPD of turgid cell is zero.
    Working: In a turgid cell, the cell is fully expanded, and TP=OP. DPD = OP - TP = 0. This statement is true.
    Key Point: Turgor pressure counters osmotic pressure.
3. Evaluate statement B: In a plasmolysed cell OP = TP.
    Working: In a plasmolysed cell, the cell membrane has pulled away from the cell wall, and there is no turgor pressure. Therefore, TP = 0 and OP is not equal to TP. This statement is false.
    Key Point: Plasmolysis occurs when water leaves the cell.
4. Evaluate statement C: $\psi _w$  of pure water is zero.
    Working: By definition, the water potential of pure water at standard temperature and pressure is zero. This statement is true.
    Key Point: Pure water is the reference point for water potential.
5. Evaluate statement D: $\psi _s$  is always negative for a solution.
    Working: Solutes lower the water potential, making the solute potential ($\psi_s$) always negative. This statement is true.
    Key Point: Adding solutes decreases water potential.
6. Identify the false statement
    Result: Statement B is false.
    Verification: Rechecking the definitions and applying them to each condition confirms statement B as the false one.
 ## OPTION ANALYSIS
[A] :x: This is a true statement as DPD is zero in turgid cells.
[B] ✓: This is the false statement. In plasmolysed cells, turgor pressure (TP) is zero, and hence OP is not equal to TP.
[C] :x: This is a true statement as the water potential of pure water is zero.
[D] :x: This is a true statement as solute potential is always negative for a solution.
 ## LEARNING AIDS
**Common Mistakes**:
1. [Error 1]: Confusing turgid and plasmolysed cell conditions. [How to avoid]: Carefully review the definitions of turgor pressure and plasmolysis.
2. [Error 2]: Misunderstanding the concept of water potential. [How to avoid]: Practice questions on water potential and its components.
**Quick Tips**:
1. [Helpful shortcut]: Remember that in a turgid cell, DPD = 0 because OP=TP.
2. [Memory aid]: Think of plasmolysis as a cell shrinking, losing its turgor pressure.

K SURESH KUMAR · Answer

DPD of turgid cell is zero

K SURESH KUMAR · Answer

The correct Option is "In a plasmolysed cell OP = TP "

K SURESH KUMAR · Answer

${\psi _w}$  of pure water is zero

K SURESH KUMAR · Answer

${\psi _s}$  is always negative for a solution

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