Question
Biology Question on biological classification
Select the wrong statement.
A
The term ' contagium vivum flu id urn' was coined by M. W. Beijerinck.
B
Mosaic disease in tobacco and AIDS in hu- man being are caused by viruses.
C
The viroids were discovered by D.J. Ivanowsky.
D
W.M. Stanley showed that viruses could be crystallised.
Answer
The viroids were discovered by D.J. Ivanowsky.
Explanation
Solution
Viroids are infectious RNA particles which were discovered by T.O. Diener (1971). These are devoid of protein coat and cause diseases in plants only, e.g., potato spindle tuber, chrysanthemum stunt etc.