Q. I. DJ Ivanowsky (1892) recognised certain microbes as causal organisms of the mosaic disease of tobacco II. MW Beijerinck (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. WM Stanley (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
Explanation
Mosaic disease of tobacco was found to be caused by a filterable agent present in the extract of diseased tobacco plant by lvanowsky (1892). Beijerinck (1896) called it Contagium vivum fluidum (living infectious fluid). Stanley (1936) crystallised Tobacco Mosaic Virus (TMV) for the first time
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.