Multiple Choice QuestionsThe cell organelles are found in
bacterial cells
cyanobacterial cells
prokaryotic cells
eukaryotic cells
Intracellular compartments are not found in the cells of
lower plants
prokaryotes
higher plants
eukaryotes
Which one of the following is also called halophiles
Eubacteria
Actinomycetes
Archaebacteria
Cyanobacteria
In which book, Bentham and Hooker proposed their classification?
Genera Plantarum
Species Plantarum
Historia Plantarum
Historia Naturae
Virus was discovered by whom
Stanley
Ivanowski
Herelle
Beijerinck
B.
Ivanowski
Ivanoski reported in 1892 that extracts from infected leaves were still infectious after filtration through a Chamberland filter-candle. Bacteria are retained by such filters, a new world was discovered: filterable pathogens. However, Ivanovski probably did not grasp the full meaning of his discovery. Beijerinck, in 1898, was the first to call 'virus', the incitant of the tobacco mosaic. He showed that the incitant was able to migrate in an agar gel, therefore being an infectious soluble agent, or a 'contagium vivum fluidum' and definitively not a 'contagium fixum' as would be a bacteria. Ivanovski and Beijerinck brought unequal but decisive and complementary contributions to the discovery of viruses.
Electron microscope is based on the principle of
electromagnetic theory
resolution of glass lenses
magnification of glass lenses
refraction of light
Lichens are described as indicator of
air pollution
water pollution
soil pollution
agriculture productivity
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