An element playing important role in nitrogen fixation is 

  • Molybdenum

  • copper

  • manganese

  • zinc

Which one of the following elements in plants is not remboilised?

  • Calcium

  • Potassium

  • Sulphur

  • Phosphorus

The free-living, anaerobic nitrogen - fixer is 

  • Beijerinckia

  • Rhodospirillum

  • Rhizobium

  • Azotobacter

For its action, nitrogenase requires

  • high input of energy

  • light

  • Mn2+

  • super oxygen radicals

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during the process of nitrogen fixation?

  • Leghaemoglobin scavenges oxygen and is pinkish in colour

  • Nodules act as a site for nitrogen fixation

  • The enzyme nitrogenase catalyse the conversion of atmospheric N2 to NH3

  • Nitrogenase is insensitive to oxygen

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