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iop Grade: 12
Why is Rhizobium categorized as a ‘symbiotic bacterium’? How does it act as a biofertiliser? 
2 years ago

Answers : (2)

2060 Points
Rhizobium is a genus of Gram-negative soil bacteria that fix nitrogen. Rhizobium forms an endosymbiotic nitrogen fixing association with roots of legumes and Parasponia. The bacteria colonize plant cells within root nodules; here the bacteria convert atmospheric nitrogen to ammonia and then provide organic nitrogenous compounds such as glutamine or ureides to the plant. The plant provides the bacteria with organic compounds made by photosynthesis.
2 years ago
132 Points
  Rhizobia normally live in the soil, but when there is limited soil nitrogen, legumes release flavonoids which signal to rhizobia that the plant is seeking symbiotic bacteria.
  When exposed to flavonoids, the Rhizobia release nodulation factor, which stimulates the plant to create deformed root hairs. Rhizobia then form an "infection thread" which allows them to enter the root cells through the root hairs.
 Once the rhizobia are inside the root cells, the root cells divide rapidly, forming a nodule. The rhizobia create ammonia from nitrogen in the air, which is used by the plant to create amino acids and nucleotides. The plant provides the bacteria with sugars.
It acts as a biofertilizer as it adds nitrogen to the soil boosting the plants growth.
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2 years ago
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