Discussion
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- Question
__________ 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
- Correct Answer
- Cyanobacteia
- 1. The phenomenon of commensalism refers to a relationship between organisms in which
Options- A. one species of a pair benefits
- B. both the species of a pair benefit
- C. one species of a pair is more benefited
- D. none of the above Discuss
- 2. The microbial ecosystem of soil includes
Options- A. biotic components of soil
- B. abiotic components of soil
- C. biotic and abiotic components of soil
- D. none of the above Discuss
- 3. Which of the following is correct?
Options- A. Mycorrhizae are fungi that form a mutually beneficial (symbiotic) relationship with plant roots
- B. The fungi aid in transmitting nutrients and water to the plant roots
- C. The increased nutrient availability from mycorrhizae is thought to be due to the additional absorbing surface provided by the fungi
- D. All of the above Discuss
- 4. The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?
Options- A. Hydrolytic
- B. Transitional
- C. methanogenic
- D. All of these Discuss
- 5. Syntrophism involves
Options- A. exchange of nutrients between two species
- B. exchange of nutrients among species
- C. no exchange of nutrients between two species
- D. no exchange of nutrients among species Discuss
- 6. The conversion of molecular nitrogen into ammonia is known as
Options- A. nitrification
- B. denitrification
- C. nitrogen fixation
- D. ammonification Discuss
- 7. 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
- 8. Bacteria, as a group, are responsible for
Options- A. nitrogen oxidation
- B. sulfur oxidation
- C. nitrogen fixation
- D. all of these Discuss
- 9. Which of the following is not the biofertilisers producing bacteria?
Options- A. Nostoc
- B. Anabaena
- C. Both (a) and (b)
- D. Clostridium Discuss
- 10. 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
Microbiology of Soils problems
Search Results
Correct Answer: one species of a pair benefits
Correct Answer: biotic and abiotic components of soil
Correct Answer: All of the above
Correct Answer: All of these
Correct Answer: exchange of nutrients between two species
Correct Answer: nitrogen fixation
Correct Answer: None of these
Correct Answer: all of these
Correct Answer: Clostridium
Correct Answer: all of the above
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