Discussion
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- Question
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
Options- A. nitrification
- B. denitrification
- C. nitrogen fixation
- D. ammonification
- Correct Answer
- denitrification
- 1. The groups of bacteria which have the ability to fix nitrogen from air to soil are
Options- A. symbiotic
- B. nonsymbiotic
- C. both (a) and (b)
- D. none of these Discuss
- 2. The diagnostic enzyme for nitrogen-fixing organisms is
Options- A. nitrogenase
- B. nitrate reductase
- C. nitrate oxidase
- D. none of these Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. The population of algae in soil is __________ that of either bacteria or fungi.
Options- A. generally smaller than
- B. generally greater than
- C. equal to
- D. none of these Discuss
- 7. The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
Options- A. Azotobacter
- B. Clostridium
- C. considerably less important in comparison to the symbiotic bacteria
- D. all of the above Discuss
- 8. For rapid decomposition by microbes, the substrate should have a C/N ratio of
Options- A. 10-20
- B. 20-30
- C. 30-40
- D. 60-80 Discuss
- 9. Degree of compost maturity can be assesed by
Options- A. infrared technique
- B. germination test
- C. both (a) and (b)
- D. none of the above Discuss
- 10. Assimilative denitrification is done by
Options- A. plants
- B. fungi
- C. prokaryotes
- D. all of these Discuss
Microbiology of Soils problems
Search Results
Correct Answer: both (a) and (b)
Correct Answer: nitrogenase
Correct Answer: a terminally differentiated cell that fixes nitrogen
Correct Answer: nitrogen fixation
Correct Answer: ingestion of bacteria
Correct Answer: generally smaller than
Correct Answer: all of the above
Correct Answer: 30-40
Correct Answer: both (a) and (b)
Correct Answer: all of these
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