Microbes In Human Welfare
Time: 30 Minute
- 1.Select the correct species which does not have the ability to fix atmospheric nitrogen?
- A.
Nostoc
- B.
Spirogyra
- C.
Azotobacter
- D.
Anabaena
- 2.The aquatic fern essential for paddy fields is
- A.
Marsilea
- B.
Azolla
- C.
Ophioglossum
- D.
Adiantum
- 3.Azotobacter and Bacillus polymyxa are the examples of
- A.
Symbiotic N2 fixers
- B.
Non-symbiotic N2 fixer
- C.
Pathogenic bacteria
- D.
Decomposers
- 4.Biological control of agricultural pests unlike chemical control is
- A.
Very expensive
- B.
Toxic
- C.
Self perpetuating
- D.
Polluting
- 5.Integrated pest management programme (IPM) emphasizes on
- A.
Biological control
- B.
Confusion technique
- C.
Pesticides
- D.
None of these
- 6.Idly batter is fermented by
- A.
Lactic acid fungi
- B.
Lactic
- C.
Acetic acid fungi
- D.
Acetic acid Bacteria
- 7.Fungal pectinase is produced by
- A.
Aspergillus niger
- B.
Aspergillus wentii
- C.
Aspergillus megaterium
- D.
Both a and b
- 8.The inexpensive and less complicated step of sewage water treatment is
- A.
Primary treatment
- B.
Secondary treatment
- C.
Tertiary treatment
- D.
None of these
- 9.Bt stands for
- A.
Bacterum thuringiensis
- B.
Bacterium thuringensis
- C.
Bacillus turingenses
- D.
Bacillus thuringiensis
- 10.Salts of nitrogen and phosphorous must be removed from treated sewage water as they cause
- A.
harm
- B.
Spoilage
- C.
Eutrophication
- D.
Eutrophism
- 11.Symbiotic association between a fungus and roots of higher plants is called
- A.
Mycelium
- B.
Mycorrhiza
- C.
Helotism
- D.
None of these
- 12.BOD stands for
- A.
Biochemical oxygen demand
- B.
Biophysical oxygen demand
- C.
Biological oxygen demand
- D.
All of these
- 13.Acetobacter aceti is involved in production of
- A.
Lactic acid
- B.
Acetic acid
- C.
Citric acid
- D.
Butyric acid
- 14.Microbes are used to kill harmful pests. This process is called
- A.
Bio microbial action
- B.
Bio contro
- C.
Bio care
- D.
None of these
- 15.Now the day came when we need to use
- A.
Chemical fertilizers
- B.
N-P-K fertilizers
- C.
Bio fertilizers
- D.
All of these
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