Microbiology of Soils problems
- 1. __________ play a key role in the transformation of rock to soil.
Options- A. Cyanobacteia
- B. Pectin decomposing bacteria
- C. Nitrifying bacteria
- D. De-nitrifying bacteria Discuss
Correct Answer: Cyanobacteia
- 2. The conversion of molecular nitrogen into ammonia is known as
Options- A. nitrification
- B. denitrification
- C. nitrogen fixation
- D. ammonification Discuss
Correct Answer: nitrogen fixation
- 3. 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
Correct Answer: None of these
- 4. Bacteria, as a group, are responsible for
Options- A. nitrogen oxidation
- B. sulfur oxidation
- C. nitrogen fixation
- D. all of these Discuss
Correct Answer: all of these
- 5. Which of the following is not the biofertilisers producing bacteria?
Options- A. Nostoc
- B. Anabaena
- C. Both (a) and (b)
- D. Clostridium Discuss
Correct Answer: Clostridium
- 6. 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
Correct Answer: all of the above
- 7. 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
Correct Answer: all of these
- 8. Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into
Options- A. ammonia
- B. glucose
- C. ATP
- D. nitrate Discuss
Correct Answer: ammonia
- 9. 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
Correct Answer: all of the above
- 10. 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
Correct Answer: both (a) and (b)
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