Microbes In Human Welfare

15 Questions | By Jagranjosh | Last updated: Mar 31, 2014 | Total Attempts: 739

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Questions and Answers

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.

Biological control of agricultural pests unlike chemical control is
- A.
  
  Very expensive
- B.
  
  Toxic
- C.
  
  Self perpetuating
- D.
  
  Polluting
4.

Azotobacter and Bacillus polymyxa are the examples of
- A.
  
  Symbiotic N2 fixers
- B.
  
  Non-symbiotic N2 fixer
- C.
  
  Pathogenic bacteria
- D.
  
  Decomposers
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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