51.
Due to which of the following organisms, yield of rice has been increased ?
A
Anabaena
B
Bacillus popilliae
C
Sesbania
D
Bacillus polymexa
Answer :
Anabaena
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52.
A nonphotosynthetic aerobic nitrogen fixing soil bacterium is
A
Rhizobium
B
Clostridium
C
Azotobacter
D
Klebsiella
Answer :
Azotobacter
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53.
Which one of the following pairs is not correctly matched?
A
Streptomyces - Antibiotic
B
Serratia - Drug addiction
C
Spirulina - Single cell protein
D
Rhizobium - Biofertilizer
Answer :
Serratia - Drug addiction
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54.
In gobar gas, the maximum amount is that of
A
butane
B
methane
C
propane
D
carbon dioxide
Answer :
methane
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55.
Select the correct statement from the following?
A
Biogas is produced by the activity of aerobic bacteria on animal waste
B
Methanobacterium is an aerobic bacterium found in rumen of cattle
C
Biogas, commonly called gobar gas, is pure methane
D
Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
Answer :
Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
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56.
Which of the following is put into Anaerobic sludge digester for further sewage treatment?
A
Floating debris
B
Effluents of primary treatment
C
Activated sludge
D
Primary sludge
Answer :
Activated sludge
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57.
Which one of the following help in absorption of phosphorus from soil by plants?
A
Glomus
B
Rhizobium
C
Frankia
D
Anabaena
Answer :
Glomus
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58.
Which one of the following pairs is wrongly matched ?
A
Yeast - ethanol
B
Streptomycetes - antibiotic
C
Coliforms - vinegar
D
Methanogens - gobar gas
Answer :
Coliforms - vinegar
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59.
A good producer of citric acid is:
A
Pseudomonas
B
Clostridium
C
Saccharomyces
D
Aspergillus
Answer :
Aspergillus
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60.
Which of the following in sewage treatment removes suspended solids?
A
Secondary treatment
B
Primary treatment
C
Sludge treatment
D
Tertiary treatment
Answer :
Primary treatment
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