What is the contribution of D1 Iwanowsky and M. W. beijerinek which respect to viruses?

Dear student,
Please find below the answer:

Iwanowski in 1892 discovered that the TMV (Tobacco Mosaic Virus) which causes mosaic disease in tobacco is smaller than any bacteria and can cross easily through porcelain bacterial filter.

M. Beijerinck in1898 further established that viruses like TMV can replicate or proliferate only in growing plant cells The term “Contagium Vivum Pasteur Fluidum” was also coined by Beijerinek. It was an infectious living fluid that was extracted by Beijerinek from the infected plants of tobacco 
.

Hope this clears your doubt.
Regards.
 

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