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M. W. Beijerinck showed that extract from infected tobacco plants could infect healthy plants. He called the infectious fluid âContagium vivum fluidum,â meaning infectious living fluid.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Five Kingdom Classification and Kingdom Plantae Animalia
Ivanowsky recognised the filterable agent causing tobacco mosaic disease in 1892. Beijerinck showed in 1898 that infected plant extract could infect healthy plants. Stanley demonstrated in 1935 that viruses could be crystallised.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Viruses Viroids Prions and Lichens
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