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Match the following and choose the most appropriate option: (each option on both columns can be matched to multiple option on the another side ie right or left) eg. A-1,2 ; B,C,D-3 ; A,B,C-3,4

A. name virus 1. M.W. Beijerinek
B. extract of infected tobacco plants cause infection in healthy plants 2.W.M. Stanley
C. causal organism of the mosaic disease of tobacco 3. Pasteur
D.viruses could be crystallised 4. Contagium vivum fluidum
E.infectious living fluid 5. D.J. Ivanowsky
F.crystals consist largely of proteins

( A ) A-5; B-2; C-3; D-1; E-1,4; F-1
( B ) A-3; B-1; C-5; D,F-2; E-1,4
( C ) A-3; B-1; C-5; D-2; E-4; F-2
( D ) A-3; B-2; C-5; D-1; E-2,4; F-1

1 Answer

(B) is the right answer.

The name virus that means venom or poisonous fluid was given by Pasteur. D.J. Ivanowsky (1892) recognised certain microbes as causal organism of the mosaic disease of tobacco (Figure 2.6a). These were found to be smaller than bacteria because they passed through bacteria-proof filters. M.W. Beijerinek (1898) demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants and called the fluid as Contagium vivum fluidum (infectious living fluid). W.M. Stanley (1935) showed that viruses could be crystallised and crystals consist largely of proteins.
answered Apr 2, 2014 by pady_1

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