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.

Which one of the following statements about nitrogenase is correct?

Rhizobium forms a symbiotic association with roots in legumes and fixes atmospheric nitrogen. Which of the following statement is correct about this process?

In biological nitrogen-fixation, the enzyme nitrogenase converts

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

Which of the following bacteria has potential for nitrogen fixation?

Bacteria responsible for Nitrification come under the following groups

Fixing of ${\mathrm{N}}_2$ by Frankia occurs in which of the following non-leguminous plants?

Nitrogen oxide formed during emission from automobiles and power plants are a source of fine air particles which lead to: