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- Question
The nitrogenase consists of
Options- A. dinitrogenase
- B. dinitrogenase reductase
- C. both (a) and (b)
- D. none of these
- Correct Answer
- both (a) and (b)
- 1. Which of the following soil microorganism is involved in the reduction of sulfates to H2S?
Options- A. Thiobacillus thiooxidans
- B. Desulfotomaculum
- C. Rhodospirillum
- D. Rhodomicrobium Discuss
- 2. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
Options- A. demonstrating growth in a nitrogen free medium
- B. cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
- C. measuring15N2 by mass spectrometer
- D. all of the above Discuss
- 3. Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have
Options- A. insufficient nutrients
- B. low pH
- C. high concentration of solutes
- D. toxic alkaline chemicals Discuss
- 4. Which of the following is best to sterilize heat labile solutions?
Options- A. Dry heat
- B. Autoclave
- C. Membrane filtration
- D. Pasteurization Discuss
- 5. Which of the following is/are vapour-phase disinfectant/s?
Options- A. Formaldehyde
- B. Ethylene oxide
- C. Both (a) and (b)
- D. None of these Discuss
- 6. Denitrification may be distinguished as
Options- A. dissimilative
- B. assimilative
- C. both (a) and (b)
- D. blue baby syndrome Discuss
- 7. The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are
Options- A. Nocardia
- B. Streptomyces
- C. Micromonospora
- D. all of these Discuss
- 8. Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as
Options- A. ingestion of bacteria
- B. ingestion of mold
- C. ingestion of fungi
- D. all of these Discuss
- 9. Some microorganisms have the ability to increase the nitrogen content of soils, are called as
Options- A. nitrogen fixation
- B. denitrification
- C. nitrification
- D. all of these Discuss
- 10. A heterocyst is
Options- A. a type of spore
- B. a terminally differentiated cell that fixes nitrogen
- C. the progenitor of cyanobacterial vegetative cells
- D. a cell that carries out oxygenic photosynthesis Discuss
Microbiology of Soils problems
Search Results
Correct Answer: Desulfotomaculum
Correct Answer: all of the above
Correct Answer: high concentration of solutes
Correct Answer: Membrane filtration
Correct Answer: Both (a) and (b)
Correct Answer: both (a) and (b)
Correct Answer: all of these
Correct Answer: ingestion of bacteria
Correct Answer: nitrogen fixation
Correct Answer: a terminally differentiated cell that fixes nitrogen
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