Microbiology of Soils problems
- 1. The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
Options- A. nitrification
- B. denitrification
- C. nitrogen fixation
- D. ammonification Discuss
Correct Answer: denitrification
- 2. The population of algae in soil is __________ that of either bacteria or fungi.
Options- A. generally smaller than
- B. generally greater than
- C. equal to
- D. none of these Discuss
Correct Answer: generally smaller than
- 3. The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
Options- A. Azotobacter
- B. Clostridium
- C. considerably less important in comparison to the symbiotic bacteria
- D. all of the above Discuss
Correct Answer: all of the above
- 4. For rapid decomposition by microbes, the substrate should have a C/N ratio of
Options- A. 10-20
- B. 20-30
- C. 30-40
- D. 60-80 Discuss
Correct Answer: 30-40
- 5. Degree of compost maturity can be assesed by
Options- A. infrared technique
- B. germination test
- C. both (a) and (b)
- D. none of the above Discuss
Correct Answer: both (a) and (b)
- 6. Assimilative denitrification is done by
Options- A. plants
- B. fungi
- C. prokaryotes
- D. all of these Discuss
Correct Answer: all of these
- 7. The physical structure of soil is improved by the accumulation of
Options- A. mold mycelium
- B. minerals
- C. water
- D. all of these Discuss
Correct Answer: mold mycelium
- 8. In the process of nitrogen fixation, which of the following microorganism is involved?
Options- A. Non symbiotic microorganisms only
- B. Symbiotic microorganisms only
- C. Non symbiotic and symbiotic microorganisms only
- D. None of the above Discuss
Correct Answer: Non symbiotic and symbiotic microorganisms only
- 9. An example of a symbiotic nitrogen fixer is
Options- A. Azotobacter
- B. Beijerinckia
- C. Clostridium
- D. Rhizobium Discuss
Correct Answer: Rhizobium
- 10. Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?
Options- A. Chromaticum
- B. Chlorobium
- C. Both (a) and (b)
- D. Rhodomicrobium Discuss
Correct Answer: Both (a) and (b)
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