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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