1.
A nitrogen-fixing microbe associated with Azolla in rice fields is:
A
Spirulina
B
Anabaena
C
Frankia
D
Tolypothrix
Answer :
Anabaena
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2.
Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition
A
Azotobacter
B
Aspergillus
C
Glomus
D
Trichoderma
Answer :
Glomus
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3.
During the formation of bread it becomes porous due to release of $$CO_2$$ by the action of
A
Yeast
B
Bacteria
C
Virus
D
Protozoans
Answer :
Yeast
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4.
Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct ?
A
Yeast - statins
B
Acetobacter aceti - acid
C
Clostridium butylicum - lactic acid
D
Aspergillus niger - citric acid
Answer :
Clostridium butylicum - lactic acid
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5.
Which one of the following is an example of carrying out biological control of pests/ diseases using microbes ?
A
Trichoderma sp. against certain plant pathogens
B
Nucleopolyhedrovirus against white rust in Brassica
C
Bt - cotton to increase cotton yield
D
Lady bird beetle against aphids in mustard
Answer :
Trichoderma sp. against certain plant pathogens
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6.
Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilisers?
A
Aspergillus and Cyanobacteria
B
Aspergillus and Rhizopus
C
Rhizobium and Rhizopus
D
Cyanobacteria and Rhizobium
Answer :
Cyanobacteria and Rhizobium
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7.
Which of the following can be used as a biocontrol agent in the treatment of plant disease?
A
Trichoderma
B
Chlorella
C
Anabaena
D
Lactobacillus
Answer :
Trichoderma
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8.
Non-symbiotic nitrogen fixers are
A
Azotobacter
B
Pseudomonas
C
soil fungi
D
blue-green algae
Answer :
Azotobacter
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9.
The organism, used for alcoholic fermentation, is
A
Pseudomonas
B
Penicillium
C
Aspergillus
D
Saccharomyces
Answer :
Saccharomyces
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10.
Azotobacter and Bacillus polymyxa are the examples of
A
symbiotic nitrogen-fixers
B
non-symbiotic nitrogen-fixers
C
ammonifying bacteria
D
disease-causing bacteria
Answer :
non-symbiotic nitrogen-fixers
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