Discussion
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- Question
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
- Correct Answer
- Non symbiotic and symbiotic microorganisms only
- 1. The physical structure of soil is improved by the accumulation of
Options- A. mold mycelium
- B. minerals
- C. water
- D. all of these Discuss
- 2. Assimilative denitrification is done by
Options- A. plants
- B. fungi
- C. prokaryotes
- D. all of these Discuss
- 3. 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
- 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
- 5. 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
- 6. An example of a symbiotic nitrogen fixer is
Options- A. Azotobacter
- B. Beijerinckia
- C. Clostridium
- D. Rhizobium Discuss
- 7. 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
- 8. Which are the main source of biofertilisers?
Options- A. Cyanobacteria
- B. Bacillus
- C. Streptococcus
- D. None of these Discuss
- 9. Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to
Options- A. slow growth
- B. medium growth
- C. fast growth
- D. none of these Discuss
- 10. Which of the following is capable of oxidizing sulfur to sulfates?
Options- A. Thiobacillus thiooxidans
- B. Desulfotomaculum
- C. Rhodospirillum
- D. Rhodomicrobium Discuss
Microbiology of Soils problems
Search Results
Correct Answer: mold mycelium
Correct Answer: all of these
Correct Answer: both (a) and (b)
Correct Answer: 30-40
Correct Answer: all of the above
Correct Answer: Rhizobium
Correct Answer: Both (a) and (b)
Correct Answer: Cyanobacteria
Correct Answer: slow growth
Correct Answer: Thiobacillus thiooxidans
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