Fresh Water Microbiology Past Papers Exam Questions

Guess Paper 1: Fresh Water Microbiology Fall – 2020 Past Papers

Time Allowed: 3 hours

Total Marks:    70, Passing Marks (35)

Q.1: Mark the following statement either as True or False. (14 Marks)

1. Fresh water is any naturally occurring water except seawater and brackish water. (T/F)

2. Giardia lamblia, also known as Giardia intestinalis, is a flagellated parasite that colonizes and reproduces in the stomach, causing giardiasis. (T/F)

3. Giardia infects humans, but is also one of the most common parasites infecting cats, dogs and birds (T/F)
4. In general terms, the greatest microbial risks are associated with ingestion of water that is contaminated with human or animal feces. (T/F)

5. V. fluvialis, Grimontia hollisae (V. hollisae), and V. mimicus can cause diarrhea or infections of the gastrointestinal tract. (T/F)

6. Bacteria play an important role in breaking down leaves into smaller, dissolved organic matter(DOM) in fresh water system. (T/F)

7. This processing of DOM to integrate it back into the classic food web is called the microbial loop.
8. Periphyton (that includes micro and macro algae) constitutes a nuisance for the water treatment specialist when it develops on the walls of structures (cover frequently required when the water contains no residual oxidant). (T/F)

9. Shigella sonnei illness is usually milder than that caused by other Shigella species (T/F)
10. Shigella dysenteriae serotype 1 causes more severe disease then other serotypes and produces a potent exotoxin (Shiga toxin). (T/F)

11. E. coli serotype O157:H7 causes abdominal pain, bloody diarrhea, and hemolytic uremic syndrome. (T/F)
12. Water stratification is when water masses with different properties – salinity (halocline), oxygenation (chemocline), density (pycnocline), temperature (thermocline) – form layers that act as barriers to water mixing which could lead to anoxia or euxinia. (T/F)

13. If your pond is stratified, you will notice the deeper water around your lower legs is noticeably warmer than the surface water. (T/F)

14. Lake overturn, is a rare type of natural disaster in which dissolved carbon dioxide (CO2) suddenly erupts from deep lake waters, forming a gas cloud that can suffocate wildlife, livestock, and humans. (T/F)

Part B (56 Marks)

Q.2 Describe cycling of Carbon and Sulphur in details? (14)

Q.3 What are the different laws of ecology? (14)

Q.4 Explain different environmental factors (biotic and abiotic) and their influence on the
distributionof microorganisms? (14)

Q.5 (a) Write a short note on freshwater microorganisms? (7)
(b) Briefly describe aquaculture? (7)

Q.6 (a) Differentiate between littoral and limnetic zone? (7)
(b) Describe Carbon cycle with the help of diagram? (7)

Q.7 Briefly describe Lake and Pond Ecosystem. Also explain its types? (14)

Q.8 Explain in details some common diseases of fresh-water fauna? (14)

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