Ncert Exercises & Solutions

When a freshly collected Spirogyra filament is kept in a 10% potassium nitrate solution, it is observed that the protoplasm shrinksin size
1. What is this phenomenon called?

2. What will happen if the filament is replaced in distilled water?

(a) Plasmolysis is the name of the phenomenon, occurring is Spirogyra filament when placed in 10% potassium nitrate solution (hypertonic solution). It occurs as water from the cell is drown out to extracellular fluid causing the protoplast to shrink away from cell wall.

(b) When the Spirogyra again reabsorb water, protoplast will again and will come back in its original shape. This phenomenon is known as deplasmolysis.

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