Name: Micro- and Macro-elements Deficiency in Plants
Uploaded: 2019-07-19
Duration: 7 min 3 s
Description: Nutrients are essential for the growth, development and reproduction of the plant. Based on their quantitative requirements, let's see their role in the life...

Question

Write a short note on biological nitrogen fixation.

Accepted Answer

The plants are not capable of absorbing nitrogen directly from the atmosphere. The conversion of molecular nitrogen into a biologically acceptable form through the activity of living organisms is called biological nitrogen fixation. It is of two types: i) asymbiotic (non-symbiotic) and ii) symbiotic nitrogen fixation.
In asymbiotic (nonsymbiotic) nitrogen fixation, the free-living microorganism converts molecular nitrogen into available forms. These microorganisms include bacteria and cyanobacteria. Examples Nostoc, Anabaena (cyanobacteria), Clostridium, Azotobacter (bacteria), etc.

Symbiotic nitrogen fixation: Symbiotic bacteria live in association with other organisms such as plants, animals, fungi, etc., and develop a mutually benefited relationship. These bacteria can convert gaseous nitrogen into the available form of plants. Rhizobium is the symbiotic nitrogen-fixing bacterium that lives inside the root cells of leguminous plants such as pea, beans, etc. It is responsible for the formation of tiny swellings called root nodules and they live in it.

Odisha Board Solutions for Exercise 11: SAMPLE QUESTIONS

Odisha Board Biology Solutions for Exercise - Odisha Board Solutions for Exercise 11: SAMPLE QUESTIONS

Questions from Odisha Board Solutions for Exercise 11: SAMPLE QUESTIONS with Hints & Solutions

Learn and Prepare for any exam you want !