NTA Abhyas NEET2020BotanyMineral NutritionPractice
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
Options
- A(ii) and (iii)
- B(i) and (iii)
- C(ii) and (iv)
- D(iii) only
Correct answer
D. (iii) only
Step-by-step solution
The process by which N 2 is reduced to NH 4+ is called nitrogen fixation. Nitrogenase enzyme catalyzes this reduction. It is only carried out by prokaryotic microorganisms. Principle N 2 -fixers include certain free-living cyanobacteria in symbiotic associations with fungi lichens or with ferns, mosses, and liverworts, and by bacteria or other microbes associated symbiotically with roots, especially those of legumes. About 15 percent of the nearly 20,000 species in the Fabaceae (leguminosae) family have been examin