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- Question
Which are the main source of biofertilisers?
Options- A. Cyanobacteria
- B. Bacillus
- C. Streptococcus
- D. None of these
- Correct Answer
- Cyanobacteria
- 1. 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
- 2. An example of a symbiotic nitrogen fixer is
Options- A. Azotobacter
- B. Beijerinckia
- C. Clostridium
- D. Rhizobium Discuss
- 3. 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
- 4. The physical structure of soil is improved by the accumulation of
Options- A. mold mycelium
- B. minerals
- C. water
- D. all of these Discuss
- 5. Assimilative denitrification is done by
Options- A. plants
- B. fungi
- C. prokaryotes
- D. all of these Discuss
- 6. 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
- 7. Which of the following is capable of oxidizing sulfur to sulfates?
Options- A. Thiobacillus thiooxidans
- B. Desulfotomaculum
- C. Rhodospirillum
- D. Rhodomicrobium Discuss
- 8. Which of the following statement is not true about composition of biogas?
Options- A. It is composed almost exclusively of methane and carbon dioxide
- B. It also contains with traces of H2S, N2, H2and CO
- C. It also contains with traces of O2 and Cl2
- D. Both (a) and (b) Discuss
- 9. The diagnostic enzyme for denitrification is
Options- A. nitrate reductase
- B. nitrate oxidase
- C. nitro oxidoreductase
- D. none of these Discuss
- 10. Syntrophism involves
Options- A. exchange of nutrients between two species
- B. exchange of nutrients among species
- C. no exchange of nutrients between two species
- D. no exchange of nutrients among species Discuss
Microbiology of Soils problems
Search Results
Correct Answer: Both (a) and (b)
Correct Answer: Rhizobium
Correct Answer: Non symbiotic and symbiotic microorganisms only
Correct Answer: mold mycelium
Correct Answer: all of these
Correct Answer: slow growth
Correct Answer: Thiobacillus thiooxidans
Correct Answer: It also contains with traces of O2 and Cl2
Correct Answer: nitrate reductase
Correct Answer: exchange of nutrients between two species
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