Agricultural Use


 
 
Concept Explanation
 

Agricultural Uses of Micro Organisms

Blue-green algae and bacteria like Rhizobium (that live in the root nodules of leguminous plants like pea and soya bean) help in fixing atmospheric nitrogen and increasing soil fertility.

  • Microorganism plays very important role in agriculture because the soil microbes (bacteria and fungi) are essential for decomposing organic matter and recycling old plant material.
  • Some soil bacteria and fungi form relationships with plant roots that provide important nutrients like nitrogen or phosphorus.  
  • Nitrification is the biological oxidation of ammonia to nitrite followed by the oxidation of the nitrite to  nitrate occuring in separate organisms or direct ammonia oxidation to nitrate. The nitrifying bacteria are Nitrosomonas, Nitrobacter, Nitrospira etc.
  • Denitrification is the process that converts nitrate to nitrogen gas, thus removing available nitrogen and returning it to the atmosphere.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Which of the following are correct :

    (a)  Some soil bacteria and fungi form relationships with plant roots that provide important nutrients like nitrogen or phosphorus.  

    (b) Nitrification is the biological oxidation of ammonia to nitrite.

    (c) Rhizobium live in the root nodules of leguminous plants like pea and soya bean.

    Right Option : D
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    Explanation
    Question : 2

    Which of the following processes involves the escaping of nitrogen into air from decaying matter ?

    Right Option : B
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    Explanation
    Question : 3

    Among the following which bacterium is associated with denitrification ?

    Right Option : B
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    Explanation
     
     
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