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- Question
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
- Correct Answer
- both (a) and (b)
- 1. 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
- 2. 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
- 3. 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
- 4. Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into
Options- A. ammonia
- B. glucose
- C. ATP
- D. nitrate Discuss
- 5. 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
- 6. 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
- 7. Nitrogen oxidation (nitrification)refers to the
Options- A. conversion of ammonium ions into nitrates through the activities of certain bacteria.
- B. changing of atmospheric nitrogen (N2) to nitrogen compounds
- C. sulfur is oxidized to the sulfate form through Thiobacillus bacteria
- D. none of the above Discuss
- 8. The biogas production process takes place at the temperature
Options- A. lesser than 25°C
- B. 25-40°C
- C. 45-60°C
- D. all of these Discuss
- 9. Which of the following is not employed as an oxidation method?
Options- A. Oxidation ponds
- B. Trickling filters
- C. Contact aerators
- D. All of these Discuss
- 10. Oxidation ponds are shallow ponds, generally designed at the depth of
Options- A. 2 to 40 feet
- B. 4 to 6 feet
- C. 1 to 3 feet
- D. 5 to 8 feet Discuss
Microbiology of Soils problems
Search Results
Correct Answer: 400-700 BTU/ft3
Correct Answer: both (a) and (b)
Correct Answer: all of the above
Correct Answer: ammonia
Correct Answer: all of these
Correct Answer: VA Mycorrhiza
Correct Answer: conversion of ammonium ions into nitrates through the activities of certain bacteria.
Correct Answer: all of these
Correct Answer: All of these
Correct Answer: 2 to 40 feet
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