MCQOPTIONS
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MCQOPTIONS
This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology of Soils knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is a symbiotic nitrogen fixing bacteria? |
| A. | Rhizobium trifolii |
| B. | Clostridium pasteurianum |
| C. | Azotobacter sp. |
| D. | Escherichia coli |
| Answer» B. Clostridium pasteurianum | |
| 2. |
How much time does nitrifying bacteria requires to grow at an incubation of 250 to 300 C? |
| A. | 1 day |
| B. | 2-3 days |
| C. | 15 days |
| D. | 1 to 4 months |
| Answer» E. | |
| 3. |
Ammonia oxidizers and nitrite oxidizers are ________________________ |
| A. | Gram-negative chemolithotrophs |
| B. | Gram-positive chemolithotrophs |
| C. | Gram-negative photolithotrophs |
| D. | Gram-positive photolithotrophs |
| Answer» B. Gram-positive chemolithotrophs | |
| 4. |
The reduction of sulphates and sulphites to hydrogen sulphide is done by which group of bacteria? |
| A. | aerobic sulfate-reducing bacteria |
| B. | photosynthetic sulphur bacteria |
| C. | anaerobic sulphate-reducing bacteria |
| D. | heterotrophic bacteria |
| Answer» D. heterotrophic bacteria | |
| 5. |
The Winogradsky column experiment is done in the dark. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Sulphates are reduced to hydrogen sulphide by _____________________ |
| A. | Desulfotomaculum sp. |
| B. | Thiobacillus thiooxidans |
| C. | Photosynthetic sulfur bacteria |
| D. | Rhodospirillum |
| Answer» B. Thiobacillus thiooxidans | |
| 7. |
Cysteine breaks down in presence of cysteine desulfurase to give _________________ |
| A. | oxaloacetic acid |
| B. | sulphuric acid |
| C. | pyruvic acid |
| D. | glyoxalate |
| Answer» D. glyoxalate | |
| 8. |
Which of the following processes is performed by Thiobacillus thiooxidans? |
| A. | converting sulphur to sulphates |
| B. | converting sulphur to sulphides |
| C. | converting sulphur to sulphites |
| D. | converting organic sulphur to inorganic sulphur |
| Answer» B. converting sulphur to sulphides | |
| 9. |
Cellobiose is metabolized directly by many microorganisms. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
In carbon cycle flow of energy is _________________ |
| A. | bidirectional |
| B. | linear |
| C. | cyclic |
| D. | irreversible |
| Answer» C. cyclic | |
| 11. |
Denitrification is carried out |
| A. | usually by facultative anaerobes |
| B. | predominantly by Pseudomonas spp |
| C. | predominantly by Bacillus spp |
| D. | all of the above |
| Answer» E. | |
| 12. |
The energy value of biogas is typically |
| A. | 400-700 BTU/ft |
| B. | 1,000 BTU/ft |
| C. | 1500 BTU/ft |
| D. | more than 5000 BTU/ft |
| Answer» B. 1,000 BTU/ft | |
| 13. |
Ammonia oxidizers and nitrite oxidizers are ______________ |
| A. | Gram-negative chemolithotrophs |
| B. | Gram-positive chemolithotrophs |
| C. | Gram-negative photolithotrophs |
| D. | Gram-positive photolithotrophs |
| Answer» B. Gram-positive chemolithotrophs | |
| 14. |
Fresh air contains approximately ______ percent carbon dioxide by volume. |
| A. | 0.01 |
| B. | 2 |
| C. | 5 |
| D. | 0.03 |
| Answer» E. | |
| 15. |
Which among the following are the most important agents for carbon dioxide fixation? |
| A. | bacteria |
| B. | fungi |
| C. | algae |
| D. | protozoa |
| Answer» D. protozoa | |
| 16. |
Which of the following are not the features of component II of nitrogenase enzyme complex? |
| A. | component II is nitrogenase reductase |
| B. | component II is known as the MoFe protein |
| C. | contains sulfur |
| D. | not active without component I |
| Answer» C. contains sulfur | |
| 17. |
Which of the following is symbiotic nitrogen fixing bacteria? |
| A. | Rhizobium trifolii |
| B. | Clostridium pasteurianum |
| C. | Azotobacter sp. |
| D. | Escherichia coli |
| Answer» B. Clostridium pasteurianum | |
| 18. |
Which of the following conditions decreases the level of denitrification? |
| A. | Abundance of organic matter |
| B. | Acidic pH |
| C. | Elevated temperatures |
| D. | Availability of oxygen |
| Answer» C. Elevated temperatures | |
| 19. |
How much time does nitrifying bacteria require to grow at an incubation of 250 to 300 C? |
| A. | 1 day |
| B. | 2-3 days |
| C. | 15 days |
| D. | 1 to 4 months |
| Answer» E. | |
| 20. |
Agrobacterium is involved in which of the following processes? |
| A. | Ammonification |
| B. | Nitrification |
| C. | Reduction of nitrate to ammonia |
| D. | Denitrification |
| Answer» E. | |
| 21. |
Nitrosococcus nitrosus is a nitrite-oxidizing bacteria. |
| A. | True |
| B. | False |
| Answer» C. | |
| 22. |
Which among the following is not an ammonia-oxidizing bacteria? |
| A. | Nitrosomonas europaea |
| B. | Nitrosovibrio tenuis |
| C. | Nitrospina gracilis |
| D. | Nitrosococcus oceanus |
| Answer» D. Nitrosococcus oceanus | |
| 23. |
Alanine gives pyruvic acid on deamination. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 24. |
The amount of organic material in the forest soil remains approximately the same from year to year. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 25. |
Cellulose is degraded to cellobiose by the enzyme __________________ |
| A. | cellulase |
| B. | beta-glucosidase |
| C. | hexokinase |
| D. | cellulose dehydrogenase |
| Answer» B. beta-glucosidase | |
| 26. |
The dominant mineral particles in most soils are compounds of _____________ |
| A. | sodium |
| B. | potassium |
| C. | magnesium |
| D. | iron |
| Answer» E. | |
| 27. |
Parasitism results from competition among organisms for essential nutrients. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 28. |
Which of the following comes under the category of positive association? |
| A. | neutralism |
| B. | parasitism |
| C. | commensalism |
| D. | ammensalism |
| Answer» D. ammensalism | |
| 29. |
Fungi produces which of the following inhibitory toxic product? |
| A. | cyanide |
| B. | fatty acids |
| C. | methane |
| D. | sulphides |
| Answer» B. fatty acids | |
| 30. |
Lytic enzymes which destroy are secreted by which of the following microorganism? |
| A. | fungi |
| B. | algae |
| C. | staphylococcus |
| D. | myxobacteria |
| Answer» E. | |
| 31. |
Which of the following types of association is present among Staphylococcus aureus and Aspergillus terreous? |
| A. | antagonism |
| B. | mutualism |
| C. | parasitism |
| D. | commensalism |
| Answer» B. mutualism | |
| 32. |
The degradation of complex molecules in soil by fungi for utilization by bacteria is an example of which type of association? |
| A. | Neutralism |
| B. | Mutualism |
| C. | Commensalism |
| D. | Antagonism |
| Answer» D. Antagonism | |
| 33. |
Which among the following is a non-sulfur purple bacteria? |
| A. | Rhodomicrobium |
| B. | Thiobacillus |
| C. | Chromatium |
| D. | Chlorobium |
| Answer» B. Thiobacillus | |
| 34. |
The association which involves the exchange of nutrients between two species is referred to as ______________ |
| A. | mutualism |
| B. | syntrophism |
| C. | commensalism |
| D. | antagonism |
| Answer» C. commensalism | |
| 35. |
Bacteria are likely to be more prevalent in soils of vineyards, orchards and apiaries. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 36. |
Which among the following develop in the upper portion of the Winogradsky column? |
| A. | Sulfate-reducing bacteria |
| B. | Green-sulfur bacteria |
| C. | Purple-sulfur bacteria |
| D. | Thiobacilli |
| Answer» E. | |
| 37. |
Which of the following organisms are known to grow on the surfaces of freshly exposed rocks? |
| A. | green algae |
| B. | diatoms |
| C. | cyanobacteria |
| D. | yeast |
| Answer» D. yeast | |