Question

​explain nodule formation and diagrammatically show the steps of nitrogen fixation biologically.

Answer 1

Multiple interactions are involved in the formation of root nodules:

1) The Rhizobium bacteria divide and form colonies. These get attached to the root hairs and epidermal cells.

2) The root hairs get curled and are invaded by the bacteria.

3) This invasion is followed by the formation of an infection thread that carries the bacteria into the cortex of the root. The bacteria get modified into rod-shaped bacteroides.

4) As a result, the cells in the cortex and pericycle undergo division, leading to the formation of root nodules.

5) The nodules finally get connected with the vascular tissues of the roots for nutrient exchange.
I hope this answer will help u!

Answer 2

Nitrogen Fixation

Explanation:

• Nodules are formed because of disease of the roots by soil microscopic organisms in the case of  crops
• The microbes frequently tainting the roots are microscopic organisms in the class Rhizobium
• The mind boggling process by which plant roots are infected by rhizobia is known as infection  
• The Rhizobium bacteria organisms live as aerobes under free-living conditions, but require anaerobic conditions during nitrogen fixation.
• This is on the enzyme that the chemical nitrogenase is exceptionally delicate to atomic oxygen
• The nodules contain leg-hemoglobin, which protects nitrogenase from oxygen  
• Rhizobia are found in the dirt and after infection, produce nodules in the legume where they fix nitrogen gas (N2) from the environment transforming it into an all the more promptly useful form of nitrogen