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MCQs

Total Questions : 186 | Page 15 of 19 pages
Question 141. Primary producers are found growing in which of the following layers of water?
  1.    upper layer
  2.    middle layer
  3.    intermediate layer
  4.    bottom layer
 Discuss Question
Answer: Option A. -> upper layer
Answer: (a).upper layer
Question 142. Thermus aquaticus, a common bacterial inhabitant generally prevails in temperatures of ____________
  1.    0° C
  2.    30-40°C
  3.    70-72°C
  4.    80-85°C
 Discuss Question
Answer: Option C. -> 70-72°C
Answer: (c).70-72°C
Question 143. Hydrostatic pressure increases the boiling point of water but does not change the solubility of nutrients.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 144. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
  1.    demonstrating growth in a nitrogen free medium
  2.    cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
  3.    All of these
  4.    measuring15N2 by mass spectrometer
 Discuss Question
Answer: Option C. -> All of these
Question 145. Which of the following is capable of oxidizing sulfur to sulfates?
  1.    Rhodomicrobium
  2.    Thiobacillus thiooxidans
  3.    Rhodospirillum
  4.    Desulfotomaculum
 Discuss Question
Answer: Option B. -> Thiobacillus thiooxidans
Question 146. The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
  1.    Clostridium
  2.    considerably less important in comparison to the symbiotic bacteria
  3.    Azotobacter
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 147. Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as
  1.    all of these
  2.    ingestion of bacteria
  3.    ingestion of mold
  4.    ingestion of fungi
 Discuss Question
Answer: Option B. -> ingestion of bacteria
Question 148. Which of the following is not the biofertilisers producing bacteria?
  1.    Nostoc
  2.    Both (a) and (b)
  3.    Clostridium
  4.    Anabaena
 Discuss Question
Answer: Option C. -> Clostridium
Question 149. Bacteria, as a group, are responsible for
  1.    sulfur oxidation
  2.    all of these
  3.    nitrogen oxidation
  4.    nitrogen fixation
 Discuss Question
Answer: Option B. -> all of these
Question 150. Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to
  1.    none of these
  2.    fast growth
  3.    slow growth
  4.    medium growth
 Discuss Question
Answer: Option C. -> slow growth

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