Define the terms 'plasmolysis' and 'deplasmolysis'.

Explanation

### Step-by-Step Solution:

1. **Definition of Plasmolysis**:
- Plasmolysis is a process that occurs in plant cells where the protoplast (the living part of the cell, including the cytoplasm and nucleus) shrinks away from the cell wall. This shrinkage happens when the cell is placed in a hypertonic solution, which has a higher concentration of solutes compared to the inside of the cell. As a result, water moves out of the cell through osmosis, leading to the contraction of the protoplast.

2. **Explanation of the Mechanism**:
- The mechanism behind plasmolysis is called exoosmosis. In this process, water exits the cell, causing the protoplast to pull away from the rigid cell wall. This phenomenon is primarily observed in plant cells due to the presence of a cell wall that maintains the cell's shape.

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