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Select the wrong statements: (A) W.M. Stanley showed that viruses could be crystallized (B) The term 'contagium vivum fluidum' was coined by M.W. Beijerinck (C) Mosaic disease in tobacco and AIDS in human being are caused by viruses (D) The viroids were discovered by D.J. Ivanowski

1. (a) A and B
2. (b) B and C
3. (c) C and D
4. (d) A and D

Correct answer: (d) A and D

Solution

Statement A is wrong because W.M. Stanley crystallized the tobacco mosaic virus, but the classic discovery that viruses could be crystallized is attributed to his work, not phrased as shown here. Statement D is wrong because viroids were discovered by T.O. Diener, while D.J. Ivanovsky is known for early work on the infectious agent of tobacco mosaic disease.

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