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

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(C) .$J$. Ivanowsky $(1892)$ 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 discovery marked the first identification of viruses.