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- Question
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into
Options- A. ammonia
- B. glucose
- C. ATP
- D. nitrate
- Correct Answer
- ammonia
- 1. The crops which are involved in nitrogen fixation are
Options- A. alfalfa and clover
- B. soybean
- C. bean and lupine
- D. all of these Discuss
- 2. Denitrification is carried out
Options- A. usually by facultative anaerobes
- B. predominantly by Pseudomonas spp
- C. predominantly by Bacillus spp
- D. all of the above Discuss
- 3. Which of the following is not the biofertilisers producing bacteria?
Options- A. Nostoc
- B. Anabaena
- C. Both (a) and (b)
- D. Clostridium Discuss
- 4. Bacteria, as a group, are responsible for
Options- A. nitrogen oxidation
- B. sulfur oxidation
- C. nitrogen fixation
- D. all of these Discuss
- 5. Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?
Options- A. Achromobacter
- B. Agrobacterium
- C. Alcaligenes
- D. None of these Discuss
- 6. The groups of symbiotic bacteria, which have the ability to fix nitrogen
Options- A. derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
- B. grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
- C. these bacteria are from the genus, Rhizobium
- D. all of the above Discuss
- 7. Nitrogen fixation
Options- A. changes the free nitrogen (N2) to a form usable by plants
- B. especially changes nitrogen compounds, mostly amines such as NH2
- C. both (a) and (b)
- D. fix the free nitrogen (N2) by which it should not be usable by plants Discuss
- 8. The energy value of biogas is typically
Options- A. 400-700 BTU/ft3
- B. 1,000 BTU/ft3
- C. 1500 BTU/ft3
- D. more than 5000 BTU/ft3 Discuss
- 9. Denitrification is
Options- A. reduction of nitrate (NO3-) to nitrogen gas
- B. reduction of nitrate to organic nitrogen compounds
- C. both (a) and (b)
- D. changing of atmospheric nitrogen (N2) to nitrogen compounds Discuss
- 10. Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?
Options- A. Saccharomyces cerevisiae
- B. VA Mycorrhiza
- C. Candida torulopsis
- D. Aspergillus niger Discuss
Microbiology of Soils problems
Search Results
Correct Answer: all of these
Correct Answer: all of the above
Correct Answer: Clostridium
Correct Answer: all of these
Correct Answer: None of these
Correct Answer: all of the above
Correct Answer: both (a) and (b)
Correct Answer: 400-700 BTU/ft3
Correct Answer: both (a) and (b)
Correct Answer: VA Mycorrhiza
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