A twig kept in water having some salt remains fresh for longer period due to

Options

A. Decrease in bacterial degradation
B. Exosmosis
C. Decrease in transpiration rate
D. Absorption of more water

Answer

### Step-by-Step Solution:

1. **Understanding the Experiment**: The question involves a twig placed in water that contains salt. The aim is to understand why the twig remains fresh for a longer period when salt is present.

2. **Normal Condition (Hypotonic Solution)**: In a typical scenario where the twig is placed in plain water (hypotonic solution), water enters the cells of the twig. This influx of water causes the cells to swell, leading to increased turgidity. While this might seem beneficial initially, excessive swelling can cause the cells to burst, leading to decay of the twig.

3. **Effect of Salt (Hypertonic Solution)**: When salt is added to the water, the solution becomes hypertonic relative to the inside of the twig's cells. In a hypertonic solution, water moves out of the cells of the twig through a process called exoosmosis. This causes the cells to shrink and lose turgidity.

4. **Result of Exoosmosis**: The shrinking of the cells due to exoosmosis helps the twig maintain its shape and structure. Since the cells are not overly swollen, the twig does not decay as quickly. This preservation of structure allows the twig to remain fresh for a longer period.

5. **Conclusion**: The twig remains fresh for a longer time in saltwater due to the process of exoosmosis, which prevents excessive swelling and decay of the cells.

### Final Answer:
The twig remains fresh for a longer period due to exoosmosis.

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