Home Biology Biological Classification Statement Based Questions (I) DJ Ivanowsky (1892) recognised certain m…
Biology Biological Classification Statement Based Questions Single Correct MCQ
Published on: August 13, 2026

(I) DJ Ivanowsky (1892) recognised certain microbes as causal organisms of the mosaic disease of tobacco.

(II) MWBeijerinck (1898) demonstrated that the extract of infected plants of tobacco could cause infection in healthy plants and called the fluid as Contagium vivum fluidum .

(III) WMStanley (1935) showed that these microbes could be crystallised and crystals consist largely of protein. The above statements are assigned to

A
Bacteria
B
Virus
C
Prions
D
Lichens

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The correct answer is:
B

The above statements are assigned to Virus. These key milestones describe the discovery of the Tobacco Mosaic Virus (TMV): Dmitri Ivanowsky (1892) identified the causal agent, M.W. Beijerinck (1898) coined "Contagium vivum fluidum" for the infectious agent, and W.M. Stanley (1935) crystallized the virus, showing it is largely protein.

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