Q.

Select the incorrect statement.

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a

Viroids were discovered by D.J. Ivanowsky.

b

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

c

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

d

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

answer is C.

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Detailed Solution

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Viroids were discovered by Raymer and Diener. D.J. Ivanowsky discovered the virus TMV.

(1) Beijerinck described TMV or virus as ‘contagium vivum fluidum’ or living infectious fluid.

(2) Viruses cause several diseases in plants, such as mosaic disease in tobacco, and also in animals, such as AIDS in man. 

(4) Stanley crystallised the virus TMV, which causes mosaic disease in tobacco.

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