Nitrogen Fixation, Nitrogen Cycle and Nitrogen Metabolism
Nitrogen Fixation, Nitrogen Cycle and Nitrogen Metabolism: Overview
This Topic covers sub-topics such as Nitrogen Cycle, Nitrogen Fixation, Transamination, Biological Nitrogen Fixation, Denitrification, Nitrification, Ammonification, Nitrogen Metabolism, Reductive Amination, Nitrate Assimilation and, Nodule Formation
Important Questions on Nitrogen Fixation, Nitrogen Cycle and Nitrogen Metabolism
The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in the leguminous root nodule is:
Define catalytic amination.
An example of transferase is
Write a short note on nitrate assimilation.
Ammonia is combined with some organic acid to form amino acid.
Nitrate assimilation involves
Fill in the blank with the correct answer from the bracket.
_____ is the most important source of nitrogen to the plant. (Ammonia, Nitrate, Nitrite)
The transfer of the amino group to a keto acid is called transamination.
Fill in the blank with the correct option provided in the bracket.
Nodule formation starts in the _____ of the root. (pith, stele, cortex)
Roots of legumes secrete flavonoids, which attracts Rhizobium towards the root.
Root nodule is formed due to the _____ association between the leguminous plant and the host-specific bacteria called the Rhizobium.
Fill in the blank with the correct option from the bracket.
Nodule formation involves a sequence of multiple interactions between _____ bacteria and the roots of the host plant. (Azotobacter, Clostridium, Rhizobium)
Fill in the blank with the correct option from the bracket.
Nodule formation starts in the _____ of the root. (epidermis, cortex, endodermis)
Roots of legumes secrete flavonoids, which attracts Rhizobium towards the root.
Study the following model of Nitrogen cycle.
Identify the concerned bacterium in step (D).
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
Bacteria responsible for Nitrification come under the following groups
Name the enzyme involved in biological nitrogen-fixation.
Which of the following is a non-symbiotic nitrogen fixer?
The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are:
