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MCQs

Total Questions : 186 | Page 5 of 19 pages
Question 41. Chemical precipitation of phosphorus is
  1.    primary treatment
  2.    secondary treatment
  3.    tertiary treatment
  4.    both (a) and (b)
 Discuss Question
Answer: Option C. -> tertiary treatment
Answer: (c).tertiary treatment
Question 42. 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.    greater
  2.    lesser
  3.    approximately equal
  4.    half
 Discuss Question
Answer: Option A. -> greater
Answer: (a).greater
Question 43. 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.    both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 44. 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.    microbial loop
  2.    Winogradsky column
  3.    Redfield ratio
  4.    Gibbs free energy
 Discuss Question
Answer: Option A. -> microbial loop
Answer: (a).microbial loop
Question 45. Hyphomycete fungi
  1.    produce nonmotile tetaradiate conidia
  2.    grow in leaves and the infected leaves are the preferred food source for some aquatic insects
  3.    both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 46. Ammonia oxidizers and nitrite oxidizers are ________________________
  1.    Gram-negative chemolithotrophs
  2.    Gram-positive chemolithotrophs
  3.    Gram-negative photolithotrophs
  4.    Gram-positive photolithotrophs
 Discuss Question
Answer: Option A. -> Gram-negative chemolithotrophs
Answer: (a).Gram-negative chemolithotrophs
Question 47. How much time does nitrifying bacteria requires to grow at an incubation of 250 to 300 C?
  1.    1 day
  2.    2-3 days
  3.    15 days
  4.    1 to 4 months
 Discuss Question
Answer: Option D. -> 1 to 4 months
Answer: (d).1 to 4 months
Question 48. Nitrosococcus nitrosus is a nitrite-oxidizing bacteria.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 49. Alanine gives pyruvic acid on deamination.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 50. Which among the following is not an ammonia-oxidizing bacteria?
  1.    Nitrosomonas europaea
  2.    Nitrosovibrio tenuis
  3.    Nitrospina gracilis
  4.    Nitrosococcus oceanus
 Discuss Question
Answer: Option C. -> Nitrospina gracilis
Answer: (c).Nitrospina gracilis

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