The practice of breaking of rocks during rainy season by inserting wooden pegs in them is based on the phenomenon of

Options

A. Imbibition Pressure
B. Osmotic pressure
C. Matric potential
D. Plasmolysis

Answer

To solve the question regarding the practice of breaking rocks during the rainy season by inserting wooden pegs, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Context**: The question describes a practice where wooden pegs are inserted into rocks during the rainy season. The purpose of this practice is to break the rocks.

2. **Identifying the Process Involved**: When the wooden pegs are inserted into the rocks and it rains, the wooden pegs absorb water. This absorption leads to the swelling of the wooden pegs.

3. **Defining Imbibition**: The process of a solid (in this case, the wooden pegs) absorbing water is known as imbibition. This phenomenon occurs when a hydrophilic material takes up water, leading to an increase in volume.

4. **Understanding the Resulting Pressure**: As the wooden pegs swell due to the absorbed water, they exert pressure on the surrounding rock. This pressure, resulting from the swelling of the wood, is referred to as imbibition pressure.

5. **Conclusion**: Therefore, the practice of breaking rocks during the rainy season by inserting wooden pegs is based on the phenomenon of imbibition pressure.

### Final Answer:
The correct answer is **imbibition pressure**.

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