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 can follow these steps:

### Step-by-Step Solution:

1. **Understand the Purpose of Preservation**:
- The primary purpose of preserving plant and animal specimens is to prevent decay and deterioration. This process is known as fixation.

2. **Identify Common Fixatives**:
- The most commonly used fixative for preserving biological specimens is formaldehyde. When formaldehyde is diluted in water, it is referred to as formalin.

3. **Evaluate the Options Provided**:
- **Liquid Nitrogen**: This is used for preserving biological samples at very low temperatures, not typically for specimens in jars.
- **Formalin**: This is a solution of formaldehyde in water and is widely used for the fixation and preservation of specimens.
- **Acetocarmine**: This is a dye used for staining cell nuclei, not for preservation.
- **Safran**: This is another staining dye used in biological applications, not for preserving specimens.

4. **Select the Correct Answer**:
- Based on the evaluation of the options, the correct solution used as a preservative for keeping plant and animal specimens in a jar is **Formalin**.

### Final Answer:
The correct solution used as a preservative for keeping plant and animal specimens in a jar is **Formalin**.

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