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MCQs

Total Questions : 186 | Page 2 of 19 pages
Question 11. Which of the following aquatic organisms contribute in a small amount to the shallow estuary food web?
  1.    benthic algae
  2.    bacteria
  3.    protozoa
  4.    nematodes
 Discuss Question
Answer: Option A. -> benthic algae
Answer: (a).benthic algae
Question 12. The term fertility of oceans is used to express the capacity for production of inorganic matter.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 13. Which among the following are referred to as the “pasture of the sea”?
  1.    fishes
  2.    algae
  3.    nematodes
  4.    phytoplankton
 Discuss Question
Answer: Option D. -> phytoplankton
Answer: (d).phytoplankton
Question 14. Which among the following factors are limiting growth of phytoplankton organisms?
  1.    carbon dioxide
  2.    radiant energy
  3.    water
  4.    radiant energy,nitrogen
 Discuss Question
Answer: Option D. -> radiant energy,nitrogen
Answer: (d).radiant energy,nitrogen
Question 15. What amount of dry organic matter is produced by the deep ocean areas?
  1.    1g
  2.    10g
  3.    0.5g
  4.    100g
 Discuss Question
Answer: Option C. -> 0.5g
Answer: (c).0.5g
Question 16. Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to
  1.    slow growth
  2.    medium growth
  3.    fast growth
  4.    none of these
 Discuss Question
Answer: Option A. -> slow growth
Answer: (a).slow growth
Question 17. The population of algae in soil is __________ that of either bacteria or fungi.
  1.    generally smaller than
  2.    generally greater than
  3.    equal to
  4.    none of these
 Discuss Question
Answer: Option A. -> generally smaller than
Answer: (a).generally smaller than
Question 18. Bacteria, as a group, are responsible for
  1.    nitrogen oxidation
  2.    sulfur oxidation
  3.    nitrogen fixation
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 19. The phenomenon of commensalism refers to a relationship between organisms in which
  1.    one species of a pair benefits
  2.    both the species of a pair benefit
  3.    one species of a pair is more benefited
  4.    none of the above
 Discuss Question
Answer: Option A. -> one species of a pair benefits
Answer: (a).one species of a pair benefits
Question 20. The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
  1.    nitrification
  2.    denitrification
  3.    nitrogen fixation
  4.    ammonification
 Discuss Question
Answer: Option B. -> denitrification
Answer: (b).denitrification

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