Reduction of nitrogen to ammonia by living organisms is called as

  1. Electrical Nitrogen Fixation
  2. Biological Nitrogen Fixation
  3. Industrial Nitrogen Fixation
  4. Both B and C
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Which of the following enzyme is exclusively in prokaryotes?

  1. Nitrogenase
  2. Pyruvate kinase
  3. Glucokinase
  4. Enolase
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Nitrogenase converts

  1. Nitrate to Nitrite
  2. Nitrogen to Ammonia
  3. Nitrogen to Nitrite
  4. Nitrogen to Nitrate
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Which of the following are not free living Nitrogen fixers?

  1. Anabaena
  2. Nostoc
  3. Azotobacter
  4. Rhizobium
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Which of the following is symbiotic nitrogen fixer?

  1. Rhodospirillum
  2. Azotobacter
  3. Beijernickia
  4. Rhizobium
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Which of the following is free living nitrogen fixing cyanobacteria?

  1. Anabaena
  2. Azotobacter
  3. Beijernickia
  4. Rhodospirillum
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Rhizobium

  1. Rod shaped
  2. Legume-bacteria relationship
  3. Has relationship with roots of several legumes such as alfalfa, sweet clover sweet pea, Lentils, garden Pea, broad bean and clover beans
  4. All of these
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The most common association on roots is as

  1. Lichene
  2. Nodules
  3. Beads
  4. Pneumathodes
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Rhizobium and Frankia

  1. Free living in soil
  2. Act as symbiont and fix nitrogen
  3. One is found on the roots of non-leguminous plants
  4. All of these
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The central portion of nodule is pink in color due to

  1. Leg- haemoglobin
  2. Haemoglobin
  3. RBC
  4. Myoglobin
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