Question

Incipient plasmolysis is
A. Last stage of plasmolysis
B. Mid stage of plasmolysis
C. Zero hour for inception of plasmolysis
D. Initial stage of plasmolysis

Answer 1

Hint: Plasmolysis is a process that occurs in plant cells in which contraction or shrinkage of the protoplasm occurs due to severe loss of water or not getting sufficient amounts of water. Plasmolysis occurs due to osmosis phenomenon and occurs rarely in nature.

Complete answer:
The process of plasmolysis takes place in three different stages that are known as incipient plasmolysis, evident plasmolysis and final plasmolysis. The whole three stages lead to total shrinkage of the plant due to insufficient water or loss in severe amounts of water from the plant cell.

Incipient plasmolysis is the initial stage of plasmolysis as in this stage water starts to move outside the cell of the plant. In this phase the volume of the cell decreases and the cell wall becomes detectable.

After incipient plasmolysis mid stage of plasmolysis that is evident plasmolysis occurs as in this stage the cell membrane of the plant reaches its limit of contraction and detaches from the cell wall attaining spherical shape.
The last stage of plasmolysis is final plasmolysis as in this stage cytoplasm becomes completely free from the cell wall and remains in between the cells.

Hence, The correct answer is option (D).

Note: There are two types of plasmolysis based on final structure of the cytoplasm that is concave plasmolysis and convex plasmolysis. During concave plasmolysis both the cell membrane and protoplasm shrinks away and detaches from the cell wall due to loss of water. During convection severe loss of water occurs that completely detach cell membrane from cell wall.