which of the following solution is used as preservative for keeping plants and animals specimen in a jar?

Options

A. liquid nitrogen
B. formalin
C. acetocarmine
D. safranine

Answer

To determine which solution is used as a preservative for keeping plant and animal specimens in a jar, we will analyze the options provided.

### Step-by-Step Solution:

1. **Identify the Purpose of the Solution**:
- The solution must preserve the specimens in an intact form, preventing decomposition and microbial growth.

2. **Evaluate the Options**:
- **Liquid Nitrogen**: This solution is used for freezing and solidifying specimens. While it preserves them by freezing, it does not keep them in a jar in a liquid state, which is typically required for display or study.
- **Formalin**: This is a solution of formaldehyde in water. It acts as a disinfectant and preservative, preventing the growth of microorganisms that could degrade the specimens. It is commonly used in laboratories and museums to preserve biological specimens.
- **Acetocarmin**: This solution is primarily used for staining tissues during dissection to enhance visibility. It does not serve as a preservative.
- **Saffron**: Similar to acetocarmin, saffron is used for coloring and does not have preservative qualities.

3. **Conclusion**:
- Based on the analysis, **Formalin** is the correct solution used as a preservative for keeping plant and animal specimens in a jar.

### Final Answer:
The correct answer is **Formalin**.