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Q.

If by radiation all the nitrogenase enzymes are inactivated, then which of the following will not occur?(i) Fixation of atmospheric NO2.(ii) Conversion from nitrate to nitrite in legumes.(iii) Fixation of nitrogen in legumes.(iv) Conversion from ammonium to nitrate in soil.

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a

(ii) and (iii)

b

(i) and (iii)

c

(ii) and (iv)

d

(iii) only

answer is D.

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Detailed Solution

If all the enzyme nitrogenase are inactivated then fixation of nitrogen in legumes will stop. But the atmospheric nitrogen fixation can still continue by physical nitrogen fixation.
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