In rainy season, the doors get wet due to

Options

A. Imbibition
B. Absorption
C. Diffusion
D. Endosmosis

Answer

**Step-by-Step Solution:**

1. **Understanding the Context**: The question asks why doors get wet during the rainy season. It is important to note that the focus is on wooden doors, as they are more affected by moisture than metallic doors.

2. **Humidity in the Air**: During the rainy season, the humidity in the air increases significantly. Humidity refers to the amount of water vapor present in the air.

3. **Properties of Wood**: Wooden doors are made up of cellulose, which is a carbohydrate. Cellulose has the ability to absorb water, although its imbibation capacity is less compared to proteins.

4. **Imbibation Process**: When the humidity increases, the cellulose in the wood absorbs the water vapor from the air through a process called imbibation. Imbibation is the absorption of water by a solid or gel, resulting in swelling.

5. **Effect on Wood**: As the cellulose imbibes water, the wooden door swells slightly. This swelling occurs because the water molecules create weak attractive forces with the cellulose, allowing the wood to absorb moisture.

6. **Absence of Living Cells**: It is important to note that the outer part of the wood (the bark) is made up of dead cells. Therefore, processes like absorption, endosmosis, and diffusion, which require living cells and a selectively permeable plasma membrane, do not occur in this case.

7. **Conclusion**: The wetness of the doors during the rainy season is primarily due to the imbibation of water vapor by the cellulose in the wood, leading to swelling and wetness.

**Final Answer**: The doors get wet during the rainy season due to the imbibation of water vapor from the humid air by the cellulose in the wood.

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