A scientist “X” demonstrated that extract of infected plants of “Y” could cause infection in healthy plants and called the fluid as “Contagium vivum fluidum”. Identify X and Y.
(X) (Y)
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(X): M.W. Beijerinck (Martinus Willem Beijerinck) in 1898 demonstrated that the sap from infected tobacco plants could cause infection in healthy tobacco plants.
(Y): Tobacco (specifically tobacco mosaic disease) was the plant studied.
Beijerinck called the filtered, infectious substance "Contagium vivum fluidum" (Latin for "contagious living fluid") because he believed it was a liquid, rather than a microscopic particulate, that could reproduce within host cells.
While D.J. Ivanowski showed the extract could pass through bacterial filters in 1892, it was Beijerinck who coined the term "Contagium vivum fluidum".
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