M5U1/9A16 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001

EMB509 – ENVIRONMENTAL MICROBIOLOGY

Time : 3 hrs

Max Marks :75 SECTION – A (10X1=10) Answer ALL the Questions

Choose the correct answer 1. The concept of putting microbes to help clean up the environment is called a) Pasteurization

b) Bioremediation

c) Fermentation

d) Biolistics

2. Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments. a) Greater

b) Lesser

c) Approximately equal

d) Half

3. Which of the following is not employed as an oxidation method? a) An oxidation pond

b) Trickling filters

c) Contact aerators

d) All of these

4. The filtering medium of trickling filters is coated with microbial flora, known as a) Zoological film

b) Geological film

c) Zooglocal film

d) none of these

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M5U1/9A16 5. Which of the following species in water reveal the presence of fecal pollution of human or animal origin? a) E.coli

b) Fecal Streptococci

c) Clostridium perfringens

d) All of these

6. Treatment of municipal water supplies is based upon a) Coagulation, filtration, chlorination b) Chlorination, filtration, coagulation c) Filtration, coagulation, chlorination d) Coagulation, chlorination, filtration 7. Removal of solids is generally considered as a a) Primary treatment

b) Secondary treatment

c) Tertiary treatment

d) None of these

8. All of the following species are considered coliforms except a) Enterobacter aerogenes

b) Klebsiella pneumonia

c) Salmonella typhi

d) Escherichia coli

9. The type of symbiosis in which one spices inhibits another species. a) Mutualism

b) Commensalism

d) Antagonism

d) Predation.

10. The type of symbiosis in which one organism live in or on another organism at the expense of the other is called a) Mutualism

b) Commensalism

c) Antagonism

d) Predation

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M5U1/9A16 SECTION - B (5X3=15) Answer any FIVE Questions 11. Write a short account on air sampling devices used for enumeration of bacteria. 12. Characteristics of freshwater habitat. 13. What are the factors affecting water microflora? 14. Give a brief account of bacteriological analysis of water quality. 15. Significance of Chemical oxygen demand of water. 16. Discuss microbe-microbe Interactions. 17. What are the various microbial interactions of Neutralism? SECTION - C (5X10=50) Answer ALL the Questions 18. a) Discuss in detail about the aerosols and droplet nuclei. (Or) b) How air can be sanitized? 19. a) Write an essay on bacterial air borne diseases. (Or) b) Write an essay on Eutrophicatoin. 20. a) Describe in detail about the sewage wastewater treatment. (Or) b) Describe microbiological standards of water in detail.

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M5U1/9A16 21. a) Comment on the threats of freshwater pollution. (Or) b) How BOD of water can be tested. 22. a) Write a brief account on the methods of Bioleaching. (Or) b) Explain Animal-microbe symbiosis. ************

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ENVIRONMENTAL MICROBIOLOGY - 04 16.pdf

a) Mutualism b) Commensalism. d) Antagonism d) Predation. 10. The type of symbiosis in which one organism live in or on another. organism at the expense of ...

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