Question

Turgor pressure of a plasmolysed cell is

• A. Positive
• B. Zero
• C. Negative
• D. None of the above

Answer 1

The correct option is C Negative

Diffusion pressure deficit (DPD) is also known as suction pressure (SP). DPD is responsible for the movement of water in a plant. Water moves from a region or cell of low DPD to a cell or region of high DPD. The DPD is calculated as the difference of osmotic pressure (which is responsible for entry of water into a cell) and turgor pressure (which opposes entry of water into a cell).

In a fully turgid cell, osmotic pressure is equal to turgor pressure and hence DPD is zero. In a plasmolyzed cell the turgor pressure will have negative value as in a plasmolyzed cell the cytoplasm will not be pressing against the cell wall but present in a shrunk state.

So, the correct answer is option C.