Select the wrong statement. (a) The term ‘contagium vivum fluidum’ was coined by M. W. Beijerinck. (b) Mosaic disease in tobacco and AIDS in human being are caused by viruses. (c) The viroids were discovered by D.J. Ivanowsky. (d) W.M. Stanley showed that viruses could be crystallised.
Option C 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.
