Microbiology of Soils problems
- 1. Which are the main source of biofertilisers?
Options- A. Cyanobacteria
- B. Bacillus
- C. Streptococcus
- D. None of these Discuss
Correct Answer: Cyanobacteria
- 2. Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to
Options- A. slow growth
- B. medium growth
- C. fast growth
- D. none of these Discuss
Correct Answer: slow growth
- 3. Which of the following is capable of oxidizing sulfur to sulfates?
Options- A. Thiobacillus thiooxidans
- B. Desulfotomaculum
- C. Rhodospirillum
- D. Rhodomicrobium Discuss
Correct Answer: Thiobacillus thiooxidans
- 4. Which of the following statement is not true about composition of biogas?
Options- A. It is composed almost exclusively of methane and carbon dioxide
- B. It also contains with traces of H2S, N2, H2and CO
- C. It also contains with traces of O2 and Cl2
- D. Both (a) and (b) Discuss
Correct Answer: It also contains with traces of O2 and Cl2
- 5. The diagnostic enzyme for denitrification is
Options- A. nitrate reductase
- B. nitrate oxidase
- C. nitro oxidoreductase
- D. none of these Discuss
Correct Answer: nitrate reductase
- 6. 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
Correct Answer: exchange of nutrients between two species
- 7. 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
Correct Answer: All of these
- 8. 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
Correct Answer: All of the above
- 9. 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
Correct Answer: biotic and abiotic components of soil
- 10. 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
Correct Answer: one species of a pair benefits
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