Metabolism of Nitrogen in Plants

What is true for cyanobacteria?

Pigment leghaemoglobin is present in the roots of:

How many ATP are required for the formation of one molecule of ${\mathrm{NH}}_3$ by the nitrogenase enzyme?

Reaction carried out by ${\mathrm{N}}_2$ metabolising microbes include

I. $2{\mathrm{NH}}_3+3{\mathrm{O}}_2\to 2{\mathrm{NO}}_2^{-}+2{\mathrm{H}}^{+}+2{\mathrm{H}}_2\mathrm{O}$

II. $2{\mathrm{NO}}_2^{-}+{\mathrm{O}}_2\to 2{\mathrm{NO}}_3^{-}$

Which of the following statements about these equations is not true?

Match Column - I with Column - II.

The enzyme nitrogenase is a

Which of the following bacterium causes denitrification?
 

For its activity, nitrogenase requires 

Which one is not a free living nitrogen fixer?

Denitrification is carried out by 

Select the mismatched pair from the following,

Which one of the following statements about nitrogenase is correct?

Root nodule is formed due to the _____ association between the leguminous plant and the host-specific bacteria called the Rhizobium.

Choose the correct statement.

Study the following model of Nitrogen cycle.

Identify the concerned bacterium in step (D).

Select the correct answer.

The following are the host plants along with the microorganisms which fix atmospheric nitrogen. Find out their correct match.
I. Frankia - Alms
II. Rhizobium - Alfalfa
III. Anabaena - Wheat
IV. Rhodospirillum - Casuarina