A) Ivanowski
B) Beijerinck
C) Stanley
D) Winogradsky
Correct Answer: A
Solution :
The credit for the discovery of virus goes to D J Ivanowski (1892), a Russian botanist who prepared an extract (juice) from the tobacco plant suffering from tobacco mosaic disease. He observed that, when extract was passed through bacteria filter (which prevent the passage of bacteria) the filtrate fluid was still infectious.
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