Select the wrong statement

Options

A. The viroids were discovered by D.J. Ivanowski
B. W.M. stanley showed that viruses could be crystallized
C. the term 'contagiumvivumfluidum' was coined by M.W. Beijerinek
D. Mosaic disease in tobaccco ad AIDS in human being are caused by viruses

Explanation

To solve the question of selecting the wrong statement regarding viroids, viruses, and their discoveries, we will analyze each of the four statements provided.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement 1**: "Viroids were discovered by D.J. Ivanovsky."
- **Analysis**: This statement is incorrect. Viroids were discovered by T.O. Diener in 1971, not D.J. Ivanovsky.

- **Statement 2**: "W.M. Stanley showed that viruses could be crystallized."
- **Analysis**: This statement is correct. W.M. Stanley was indeed the first to crystallize a virus in 1935.

- **Statement 3**: "The term contagium vivum fluidum was coined by M.W. Beijerinck."
- **Analysis**: This statement is correct. M.W. Beijerinck coined this term to describe infectious agents that could pass through filters that retained bacteria.

- **Statement 4**: "A mosaic disease in tobacco and AIDS in human beings are caused by viruses."
- **Analysis**: This statement is correct. Both the tobacco mosaic virus and the HIV virus cause diseases in their respective hosts.

2. **Conclusion**:
- Based on the analysis, the wrong statement is **Statement 1**: "Viroids were discovered by D.J. Ivanovsky."

### Final Answer:
The wrong statement is: **Viroids were discovered by D.J. Ivanovsky.**

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