Question

At zero turgor pressure the cell shows
A.Evident plasmolysis
B. Incipient plasmolysis
C. Limiting plasmolysis
D. Deplasmolysis.

Answer 1

The process in which cells lose water and protoplast shrinks in a hypertonic solution is known as Plasmolysis. The turgor pressure reduces as the cell loses more water. In a flaccid cell, the plant cells possess zero turgor pressure.

Complete answer: At zero turgor pressure, and osmotic potential equal to its water potential and limiting plasmolysis is detected. At limiting plasmolysis, pressure potential is always zero. In the turgid cell, the turgor pressure is high. Limiting plasmolysis is the pressure potential that is zero and the osmotic concentration of cell interior is just equivalent to that of external solution (isotonic).
-Evident plasmolysis: Evident Plasmolysis is the stage when the cell wall has reached its limit of contraction. At this stage, the cytoplasm has detached from the cell wall fulfilling a spherical shape is called evident plasmolysis.
-Incipient plasmolysis: The point at which the protoplast is just pulled away from the cell wall at corners is known as incipient plasmolysis. When protoplast is entirely separated from the cell wall, it is referred to as evident plasmolysis. When cytoplasm is found at the center of the cell, it is known as the final plasmolysis.
-Deplasmolysis: Plasmolysis refers to the process in which cells lose water in a hypertonic solution whereas the reverse process is known as deplasmolysis or cytolysis. It occurs if the cell is in a hypotonic solution resulting in a lower external osmotic pressure and a net flow of water into the cell.
Thus, the correct answer is option C.

Note: Many things have to be taken into account when measuring turgor pressure in plants. It is commonly stated that fully turgid cells have a turgor pressure value which is identical to that of the cell and that flaccid cells have a value at or near zero.