The Environmental Microbiology Challenge Posted inQuiz Quiz: Environmental Microbiology Posted by kanwar July 14, 20241 31 Created on July 14, 2024 The Environmental Microbiology Challenge Delve into the unseen world where microbes shape our planet. Test your mastery of the microscopic forces that drive ecosystems, remediate pollution, and influence global cycles. 1 / 20 1. Which of the following is NOT a common method for identifying microorganisms? A. Gram staining B. Fatty acid methyl ester (FAME) analysis C. Electron microscopy D. 16S rRNA gene sequencing Electron microscopy visualizes microbes but doesn’t directly identify them like the other techniques. Electron microscopy visualizes microbes but doesn’t directly identify them like the other techniques. 2 / 20 2. The rhizosphere is characterized by: A. Absence of plant-microbe interactions B. Lower nutrient availability compared to bulk soil C. Increased microbial activity compared to bulk soil D. Predominance of anaerobic microorganisms The rhizosphere, the area around plant roots, is a hotbed of microbial activity due to root exudates. 3 / 20 3. What is the primary electron acceptor in dissimilatory metal reduction? A. Nitrate B. Oxygen C. Sulfate D. A metal cation (e.g., Fe3+) In dissimilatory metal reduction, microbes use metal ions as terminal electron acceptors in their metabolism. In dissimilatory metal reduction, microbes use metal ions as terminal electron acceptors in their metabolism. 4 / 20 4. The primary role of fungi in the biogeochemical cycling of phosphorus is: A. Fixation of atmospheric phosphorus B. Immobilization of inorganic phosphorus C. Solubilization of insoluble phosphorus D. Mineralization of organic phosphorus Fungi break down organic phosphorus compounds, releasing inorganic forms for plant uptake. Fungi break down organic phosphorus compounds, releasing inorganic forms for plant uptake. 5 / 20 5. The concept of ‘rare biosphere’ primarily refers to: A. Microbes inhabiting extreme environments B. Microbes resistant to all known antibiotics C. Microbes exclusively found in marine ecosystems D. Microbes with low abundance but high functional significance The rare biosphere concept highlights the importance of less abundant microbes that play crucial roles in ecosystems. 6 / 20 6. The concept of ‘microbial dark matter’ refers to: A. Microbes that are not yet sequenced or characterized B. Microbes that thrive in low-light conditions C. Microbes that are exclusively pathogenic D. Microbes that are resistant to all known cultivation techniques Microbial dark matter represents the vast uncharted territory of microbial diversity. 7 / 20 7. What is the role of biofilms in bioremediation? A. They hinder bioremediation by protecting contaminants. B. They enhance bioremediation by concentrating microbes and nutrients. C. They have no significant role in bioremediation. D. They only play a role in bioremediation in aquatic environments. 8 / 20 8. Which of the following is an example of a symbiotic relationship between a microbe and a plant? A. Mycorrhizae B. Neither a nor b C. Rhizobia D. Both a and b 9 / 20 9. What are the three domains of life? A. Plants, Animals, and Microbes B. Prokaryotes, Eukaryotes, and Viruses C. Bacteria, Protists, and Fungi D. Bacteria, Archaea, and Eukarya 10 / 20 10. What is the difference between sterilization and disinfection? A. Sterilization kills all microorganisms, while disinfection only reduces their number. B. Sterilization uses heat, while disinfection uses chemicals. C. There is no difference; the terms are interchangeable. D. Sterilization is used on living tissue, while disinfection is used on inanimate objects. Sterilization is a more extreme process that eliminates all microbial life. Sterilization is a more extreme process that eliminates all microbial life. 11 / 20 11. Which of the following microbial processes is crucial for the removal of nitrogen from wastewater treatment plants? A. Nitrogen fixation B. Nitrification C. Anammox D. Denitrification 12 / 20 12. What is the difference between autotrophic and heterotrophic microorganisms? A. Autotrophs use organic carbon, while heterotrophs use inorganic carbon. B. Autotrophs produce their own food, while heterotrophs consume other organisms. C. Autotrophs are bacteria, while heterotrophs are archaea. D. Autotrophs are found in soil, while heterotrophs are found in water. 13 / 20 13. Which type of microbial metabolism is used to treat acid mine drainage? A. Sulfate reduction B. Nitrogen fixation C. Iron oxidation D. Methanogenesis 14 / 20 14. Quorum sensing in bacteria is primarily mediated by: A. Exchange of genetic material B. Signaling molecules called autoinducers C. Direct physical contact between cells D. Environmental cues like temperature and pH Autoinducers are the chemical messengers bacteria use for quorum sensing. Autoinducers are the chemical messengers bacteria use for quorum sensing. 15 / 20 15. Which of the following is a major concern associated with antibiotic resistance genes (ARGs) in the environment? A. ARGs can increase the virulence of environmental microbes. B. ARGs can be transferred to human pathogens, making infections harder to treat. b) d) C. ARGs can directly harm plant growth. D. ARGs can accumulate in the food chain. The spread of antibiotic resistance genes is a major public health concern. The spread of antibiotic resistance genes is a major public health concern. 16 / 20 16. In anaerobic digestion, the conversion of volatile fatty acids (VFAs) to methane is primarily carried out by: A. Syntrophic bacteria B. Sulfate-reducing bacteria C. Acetogenic bacteria D. Methanogenic archaea Methanogenic archaea, unique microbes specialize in the final step of methane production during anaerobic digestion 17 / 20 17. Which of the following is NOT a primary mechanism by which microbes contribute to soil aggregate formation? A. Hyphal entanglement B. Mineral weathering C. Nitrogen fixation D. Exopolysaccharide production While beneficial for plants, nitrogen fixation doesn’t directly contribute to soil structure formation like the other options. 18 / 20 18. Which of the following is NOT a factor that affects the microbial diversity in soil? A. pH B. Temperature C. Atmospheric pressure D. Moisture content 19 / 20 19. Which of the following is NOT a characteristic of a good indicator organism for fecal contamination in water? A. Easy to detect and quantify B. Present in the intestines of warm-blooded animals C. Survives longer than pathogens in the environment D. Capable of causing disease in humans Indicator organisms signal potential contamination but aren’t necessarily pathogenic themselves. Indicator organisms signal potential contamination but aren’t necessarily pathogenic themselves. 20 / 20 20. Which of the following bioremediation strategies primarily relies on enhancing the indigenous microbial population to degrade contaminants? A. Bioaugmentation B. Biostimulation C. Phytoremediation D. Bioventing Biostimulation enhances native microbes’ ability to degrade pollutants, Your score isThe average score is 50% 0% Restart quiz Send feedback Author kanwar Kanwar Bhan Godara UGC NET JRF Environmental Science View all posts kanwar Kanwar Bhan Godara UGC NET JRF Environmental Science View All Posts Post navigation Previous Post Quiz: Environmental Toxicology and PollutionNext PostQUIZ: Fundamentals of Analytical Methods
Pingback: Environmental Microbiology - The Environmental Science