If by radiation all the nitrogenase enzymes are inactivated, then which of the following will not occur?
(i) Fixation of atmospheric NO_2.
(ii) Conversion from nitrate to nitrite in legumes.
(iii) Fixation of nitrogen in legumes.
(iv) Conversion from ammonium to nitrate in soil.

• A

  (ii) and (iii)

• B

  (i) and (iii)

• C

  (ii) and (iv)

• D

  (iii) only