Two nitrogen atoms are joined by

Nitrogen is present in the soil in the form of I. Nitrates II. Ammonial salts III. Nitrite IV. None of these

If by radiation all nitrogenase enzymes are inactivated, then there will be no

Nitrogen is required mainly by which of the following parts of the plants?

I. Meristematic tissues

II. Differentiating tissues

III. Apical tissues

IV. Metabolically active cell

Choose the correct option

The free energy change ($\Delta G$) for nitrogen fixation is highly positive. Which of the following BEST explains how biological nitrogen fixation occurs despite this energetic barrier?

Unlike legumes which form nodules with Rhizobium, Alnus forms nodules with:

For the limited nitrogen that is present in the soil, microbes compete with

Which of the given prokaryotes fixes nitrogen symbiotically as well as in free living state?

Nitrosomonas and Nitrococcus are involved in

Which of the following statements is INCORRECT regarding the nitrogenase enzyme complex?

Select the match ones.I Nitrosomonas – Nitrite to nitrateII Thiobacillus - DenitrificationIII Nostoc - Free-living nitrogen-fixerIV Azotobacter - Anaerobic nitrogen-fixer