(C) In $1892$,$D$.$J$. Ivanowsky recognized certain microbes as causal organisms of the mosaic disease of tobacco. These were found to be smaller than

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(C) In $1892$,$D$.$J$. Ivanowsky recognized certain microbes as causal organisms of the mosaic disease of tobacco. These were found to be smaller than bacteria because they passed through bacteria-proof filters. This led to the discovery of the Tobacco Mosaic Virus $(TMV)$.