Which one of the following is an INCORRECT pair ?

Options

A. Louis Pasteur- Coined the term 'virus'
B. Beijerinck - contagium vivum fluidum
C. Invanowsky - Studied mosaic diseases of tobacco.
D. Stanley - Crystallised TMV

Answer

To solve the question regarding which pair is incorrect, we need to analyze each option provided and verify the accuracy of the statements.

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four pairs. We need to evaluate each one to determine if it is correct or incorrect.
- Option 1: Lewis Pasteur coined the term virus.
- Option 2: Beijerinck, Contagium Vivum Fluidum.
- Option 3: Iwanowski studied mosaic diseases of tobacco.
- Option 4: Stanley, Crystallized TMV.

2. **Evaluate Option 1**:
- **Statement**: Lewis Pasteur coined the term virus.
- **Analysis**: This statement is incorrect. The term "virus" was actually coined by M.W. Beijerinck. Therefore, this pair is incorrect.

3. **Evaluate Option 2**:
- **Statement**: Beijerinck, Contagium Vivum Fluidum.
- **Analysis**: This statement is correct. Beijerinck referred to viruses as "Contagium Vivum Fluidum," which means "contagious living fluid." Thus, this pair is correct.

4. **Evaluate Option 3**:
- **Statement**: Iwanowski studied mosaic diseases of tobacco.
- **Analysis**: This statement is correct. Iwanowski was known for his work on the tobacco mosaic virus, which was initially thought to be caused by bacteria. Thus, this pair is correct.

5. **Evaluate Option 4**:
- **Statement**: Stanley, Crystallized TMV.
- **Analysis**: This statement is also correct. Wendell Stanley was the first to crystallize the tobacco mosaic virus (TMV) in 1935. Thus, this pair is correct.

6. **Conclusion**: After evaluating all options, we find that the only incorrect pairing is:
- **Lewis Pasteur coined the term virus** (Option 1).

### Final Answer:
The incorrect pair is: **Lewis Pasteur coined the term virus**.