If all $Nitrogenase$ enzymes are inactivated by radiation,which of the following processes will not occur?

  • A
    Conversion of ammonium to nitrate in the soil
  • B
    Nitrogen fixation in leguminous plants
  • C
    Fixation of atmospheric nitrogen
  • D
    Conversion of nitrate to nitrite in leguminous plants

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The nitrogen-fixing symbiotic organism present in $Azolla$ is:

Which of the following is a symbiotic microorganism?

Symbiotic nitrogen fixation in root nodules of some legumes is caused by

Select the correct statements from the given:
$(a)$ Nitrogenase is a heterodimeric protein.
$(b)$ Root hairs curl by action of nitrogenase and plant 'nod factors'.
$(c)$ During symbiotic $N_2$ fixation,$ATP$ is provided by the legume plant.

We find that $Rhizobium$ forms nodules on the roots of leguminous plants. Also,$Frankia$,another microbe,forms nitrogen-fixing nodules on the roots of the non-leguminous plant $Alnus$. What kind of relationship is observed between mycorrhiza and pine trees?

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