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Q. Given diagram illustrates the changes that occur when a plant cell takes up water. Identify L, M and N and select the incorrect statement regarding the given diagramBiology Question Image

Transport in Plants

Solution:

Given diagram illustrates the changes that occur when a flaccid plant cell takes up water. $L$ represents osmotic pressure $(OP)$ or solute potential $\left(\Psi_{s}\right)$, $M$ represents turgor pressure $(TP)$ or pressure potential $\left(\Psi_{p}\right)$ and $N$ represents diffusion pressure deficit $(DPD)$ or water potential $\left(\Psi_{w}\right)$.
In a flaccid cell, $TP$ is zero, therefore, $DPD = OP - O = OP$. When a flaccid cell is placed in water, it takes up water due to endosmosis, $OP$ of the cell starts decreasing while $TP$ starts increasing. In fully turgid condition, $OP$ and $TP$ become equal so that $DPD$ becomes zero.