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Mineral Nutrition question bank (Biology)

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Q1.

Which one of the following statements is CORRECT about biological nitrogen fixation in plants?

(A)

Atmospheric nitrogen is fixed by Nitrogenase by converting $\mathrm{N}_2$ to $\mathrm{NO}_3^{-}$.

(B)

The catalytic redox center of Nitrogenase contains Mo and Fe as cofactors.

(C)

The transport of important amides, like asparagine and glutamine, produced by transamination, to different parts of the plant body is mediated by phloem.

(D)

Nitrogenase can function optimally only in the presence of molecular oxygen.

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Q2.

Given below are two statements regarding nitrogen fixation in plants.
Statement I - Nitrogen fixing bacteria use high energy to fix each molecule of nitrogen to form ammonia, which is an exothermic reaction.
Statement II - Chemoautotrophic bacteria obtain energy during nitrification of ammonia into nitrate, which is an endothermic reaction.
In the light of the above statements, select the correct option given below:

(A)

Both statement I and statement II are correct.

(B)

Both statement I and statement II are incorrect.

(C)

Statement I is correct but statement II is incorrect.

(D)

Statement I is incorrect but statement II is correct.

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