A) W. M. Stanley showed that viruses could be crystallized.
B) The term 'contagium vivumfluidum' was coined by M. W. Beijerinck.
C) Mosaic disease in tobacco and AIDS in human beings are caused by viruses.
D) The viroids were discovered by D. J. Ivanowsky.
Correct Answer: D
Solution :The name virus that means venom or poisonous fluid was given by D. J. Ivanowsky (1892) and he recognized certain microbes as causal organism of the mosaic disease of tobacco. These were found to be smaller than bacteria because they passed through bacteria-proof filters. M. W. Beijerinck (1898) demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants and called the fluid as Contagium vivumfluidum (infectious living fluid). W. M. Stanley (1935) showed that viruses could be crystallized and crystals consist largely of proteins. Hence, the correct option is [d].
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