341.
"Potato mosaic" disease is caused by A
Fungi
B
Bacteria
C
Virus
D
Mycoplasma
Answer :
Virus
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342.
In which of the following cell wall is divided in two half parts A
Diatoms
B
Dinoflagellates
C
Euglenoids
D
Red algae
Answer :
Diatoms
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343.
Which of the following stage of Entamoeba histolytica cause intestinal ulceration A
Metacystic trophozoits
B
Binucleate stage
C
Tetranucleate stage
D
Trophozoites
Answer :
Trophozoites
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344.
Asexual reproduction in bacteria occurs by A
Conidia formation
B
Cyst formation
C
Endospore formation
D
All of the above
Answer :
All of the above
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345.
Nitrogen fixer soil organisms belong to A
mosses
B
bacteria
C
green algae
D
soil fungi
Answer :
bacteria
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Only some bacteria and blue green algae (cynobacteria) have the capacity to fix atmospheric nitrogen.
346.
Dinoflagellates glow during dark because A
Their body contains large amount of phosporus
B
Their body is covered by luminiscent layer
C
They absorb light and emit some part of it
D
Or chemical reaction between Lucifein Luciferase
Answer :
Or chemical reaction between Lucifein Luciferase
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347.
The study of effect of age on living beings is called A
Palaentology
B
Gerontology
C
Anthropology
D
Actinobiology
Answer :
Gerontology
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348.
Which among the following is not a prokaryote? A
Saccharomyces
B
Mycobacterium
C
Oscillatoria
D
Nostoc
Answer :
Saccharomyces
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Saccharomyces i.e. yeast is an eukaryote (unicellular fungi). Mycobacterium is a
bacterium. Oscillatoria and Nostoc are cyanobacteria.
349.
Bacteria useful in dairy and curdling of milk is A
Monococus
B
Diplococus
C
Streptococcus & Lactobacillus
D
Streptomyces
Answer :
Streptococcus & Lactobacillus
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350.
A few organisms are known to grow and multiply at temperatures of 100° - 105° $$C.$$ They belong to A
marine archaebacteria
B
thermophilic sulphur bacteria
C
hot-spring blue-green algae (cyanobacteria)
D
thermophilic, subaerial fungi
Answer :
marine archaebacteria
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These are archaebacteria which can tolerate high temperature.