Microbes In Aquatic Environment(Microbiology ) Questions and Answers

Question 1. The Redfield ratio is an index of concentration of
  1.    carbon, hydrogen and oxygen
  2.    carbon, phosphorous and sulfur
  3.    nitrogen, potassium and iron
  4.    carbon, nitrogen and phosphorous
Explanation:-
Answer: Option D. -> carbon, nitrogen and phosphorous
Question 2. The sulfur pearl of Namibia, Thiomargarita namibiensis
  1.    is the worlds smallest bacterium
  2.    stores high concentrations of nitrate in a huge internal vacuole which takes up 98% of the organisms volume
  3.    Both (a) and (b)
  4.    is the worlds largest bacterium
Explanation:-
Answer: Option C. -> Both (a) and (b)
Question 3. Chemical precipitation of phosphorus is
  1.    secondary treatment
  2.    both (a) and (b)
  3.    primary treatment
  4.    tertiary treatment
Explanation:-
Answer: Option D. -> tertiary treatment
Question 4. Removal of solids is generally considered as a
  1.    Primary treatment
  2.    None of these
  3.    Tertiary treatment
  4.    Secondary treatment
Explanation:-
Answer: Option A. -> Primary treatment
Question 5. All of the following species are considered coliforms except
  1.    Enterobacter aerogenes
  2.    Klebsiella pneumoniae
  3.    Escherichia coli
  4.    Salmonella typhi
Explanation:-
Answer: Option D. -> Salmonella typhi
Question 6. Metabolism of dissolved organic material released by phytoplankton allows heterotrophic bacteria to become part of the particulate organic matter that is passed up the food web to be metabolized and released as mineral elements and CO2 at each transfer. This sentence describes the
  1.    Gibbs free energy
  2.    Winogradsky column
  3.    microbial loop
  4.    Redfield ratio
Explanation:-
Answer: Option C. -> microbial loop
Question 7. The amount of oxygen dissolved in hypolimnion water in the winter is __________ to/than the amount of oxygen dissolved in hypolimnion water in the summer
  1.    half
  2.    greater
  3.    approximately equal to
  4.    lesser
Explanation:-
Answer: Option B. -> greater
Question 8. Hyphomycete fungi
  1.    produce nonmotile tetaradiate conidia
  2.    both (a) and (b)
  3.    None of these
  4.    grow in leaves and the infected leaves are the preferred food source for some aquatic insects
Explanation:-
Answer: Option B. -> both (a) and (b)
Question 9. Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments.
  1.    half
  2.    approximately equal
  3.    lesser
  4.    greater
Explanation:-
Answer: Option D. -> greater
Question 10. Coliforms are used as indicator organisms because
  1.    they are present wherever enteric pathogens are present
  2.    a testing procedure with great specificity is easy to perform
  3.    None of these
  4.    both (a) and (b)
Explanation:-
Answer: Option D. -> both (a) and (b)
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