Select the wrong statements

Options

A. W.M Stanley showed that viruses could he crystallised
B. The term 'Contagium vivum fluicdum was coined by M.W Beijerinek
C. Mosaic disease in tubacco and AlDS in human being are caused by viruses
D. The viroids were discovered hy D J. Ivanowsky

Answer

To solve the question of selecting the wrong statement among the provided options, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement 1: W.M. Stanley showed that viruses could be crystallized.**
- This statement is correct. W.M. Stanley was a scientist who demonstrated that viruses could be crystallized in 1935. This was a significant finding in virology.

2. **Statement 2: The term "Contagium vivum fluidum" was coined by M. W. Beijerinck.**
- This statement is also correct. The term "Contagium vivum fluidum," which translates to "infectious living fluid," was indeed coined by the Dutch microbiologist Martinus Beijerinck in 1898.

3. **Statement 3: Mosaic disease in tobacco and AIDS in human beings are caused by viruses.**
- This statement is correct as well. Both Mosaic disease in tobacco and AIDS (Acquired Immunodeficiency Syndrome) in humans are caused by viral infections.

4. **Statement 4: The Viroids were discovered by D.J. Ivanowski.**
- This statement is incorrect. Viroids, which are infectious agents that consist of a short strand of circular RNA, were actually discovered by T.O. Diener in 1971, not D.J. Ivanowski.

### Conclusion:
The wrong statement among the options is the fourth statement: "The Viroids were discovered by D.J. Ivanowski."

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