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MCQs

Total Questions : 186 | Page 9 of 19 pages
Question 81. Large spiraling surface currents in the ocean that tend to aggregate and retain nutrients are known as _______________
  1.    benthic region
  2.    upwelling
  3.    geothermal vents
  4.    gyres
 Discuss Question
Answer: Option D. -> gyres
Answer: (d).gyres
Question 82. Most aquatic microorganisms can grow on the usual laboratory media.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 83. Which of the following techniques is used for identification and enumeration of algae, bacteria, protozoa?
  1.    Microscopic examination
  2.    Submerged-slide technique
  3.    Membrane-filter technique
  4.    Enrichment-culture technique
 Discuss Question
Answer: Option A. -> Microscopic examination
Answer: (a).Microscopic examination
Question 84. Which of the following genus of bacteria is not found in fresh waters?
  1.    Pseudomonas
  2.    Flavobacterium
  3.    Aeromonas
  4.    Vibrio
 Discuss Question
Answer: Option D. -> Vibrio
Answer: (d).Vibrio
Question 85. The primary producers transform radiant energy into heat energy.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 86. The primary producers in the marine system are ________________
  1.    protozoa
  2.    cyanobacteria
  3.    fungi
  4.    cyanobacteria and eukaryotic algae
 Discuss Question
Answer: Option D. -> cyanobacteria and eukaryotic algae
Answer: (d).cyanobacteria and eukaryotic algae
Question 87. Which of the following water bodies, the role of photosynthetic organisms is considerably reduced?
  1.    Lakes
  2.    Ponds
  3.    Estuaries
  4.    Streams
 Discuss Question
Answer: Option C. -> Estuaries
Answer: (c).Estuaries
Question 88. The biological activity of an aquatic ecosystem is dependent upon which of the following factors?
  1.    number of primary producers
  2.    amount of chemical energy produced
  3.    rate of primary production
  4.    number of deaths of organisms
 Discuss Question
Answer: Option C. -> rate of primary production
Answer: (c).rate of primary production
Question 89. Which among the following oceans is the most richest in life?
  1.    Antarctic Ocean
  2.    Atlantic Ocean
  3.    Pacific Ocean
  4.    Indian Ocean
 Discuss Question
Answer: Option A. -> Antarctic Ocean
Answer: (a).Antarctic Ocean
Question 90. Which of the following organism have siliceous skeletons?
  1.    Foraminifera
  2.    Coccolithophores
  3.    Radiolaria
  4.    Cyanobacteria
 Discuss Question
Answer: Option C. -> Radiolaria
Answer: (c).Radiolaria

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