microbiology-of-soils microbiology question and answers -Page first

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Microbiology of Soils problems

1. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
Options
A. demonstrating growth in a nitrogen free medium
B. cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
C. measuring¹⁵N₂ by mass spectrometer
D. all of the above

Discuss

Correct Answer: all of the above

2. Which of the following soil microorganism is involved in the reduction of sulfates to H₂S?
Options
A. Thiobacillus thiooxidans
B. Desulfotomaculum
C. Rhodospirillum
D. Rhodomicrobium

Discuss

Correct Answer: Desulfotomaculum

3. The nitrogenase consists of
Options
A. dinitrogenase
B. dinitrogenase reductase
C. both (a) and (b)
D. none of these

Discuss

Correct Answer: both (a) and (b)

4. Denitrification may be distinguished as
Options
A. dissimilative
B. assimilative
C. both (a) and (b)
D. blue baby syndrome

Discuss

Correct Answer: both (a) and (b)

5. The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are
Options
A. Nocardia
B. Streptomyces
C. Micromonospora
D. all of these

Discuss

Correct Answer: all of these

6. 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

Correct Answer: ingestion of bacteria

7. 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

Correct Answer: nitrogen fixation

8. 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

Correct Answer: a terminally differentiated cell that fixes nitrogen

9. The diagnostic enzyme for nitrogen-fixing organisms is
Options
A. nitrogenase
B. nitrate reductase
C. nitrate oxidase
D. none of these

Discuss

Correct Answer: nitrogenase

10. 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

Correct Answer: both (a) and (b)

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