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- Question
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
- Correct Answer
- all of the above
- 1. 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
- 2. Which of the following is best to sterilize heat labile solutions?
Options- A. Dry heat
- B. Autoclave
- C. Membrane filtration
- D. Pasteurization Discuss
- 3. 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
- 4. Bactericidal concentration of phenol is
Options- A. 0.25%
- B. 0.5%
- C. 0.75%
- D. 1% Discuss
- 5. Which of the following material is sterilized by heating at 160°C in a hot air oven for one hour?
Options- A. Swab sticks
- B. All-glass syringes
- C. Oils and jellies
- D. All of these Discuss
- 6. 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
- 7. The nitrogenase consists of
Options- A. dinitrogenase
- B. dinitrogenase reductase
- C. both (a) and (b)
- D. none of these Discuss
- 8. Denitrification may be distinguished as
Options- A. dissimilative
- B. assimilative
- C. both (a) and (b)
- D. blue baby syndrome Discuss
- 9. 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
- 10. 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
Microbiology of Soils problems
Search Results
Correct Answer: high concentration of solutes
Correct Answer: Membrane filtration
Correct Answer: Both (a) and (b)
Correct Answer: 1%
Correct Answer: All of these
Correct Answer: Desulfotomaculum
Correct Answer: both (a) and (b)
Correct Answer: both (a) and (b)
Correct Answer: all of these
Correct Answer: ingestion of bacteria
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