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Question:

Select the wrong statement. Mosaic disease in tobacco and AIDS in human being are caused by viruses. The viroids were discovered by D.J. Ivanowski. W.M. Stanley showed that viruses could be crystallized. The term 'contagium vivum fluidum' was coined by M.W. Beijerinek.

The term 'contagium vivum fluidum' was coined by M.W. Beijerinek.

W.M. Stanley showed that viruses could be crystallized.

Mosaic disease in tobacco and AIDS in human being are caused by viruses.

The viroids were discovered by D.J.Ivanowski.

Solution:

Viroids are small infectious particles which are composed of single strand RNA without a protein coat. An agriculture researcher named Theodor O Diener discovered and characterized it while working on potato spindle disease. Thus, the correct answer is option D.