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Question
Name a free-living and a symbiotic bacterium that serve as bio-fertiliser. Why are they so called? [2]
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Solution
Free living Bacteria — Azotobacter clostridium [0.5]
Symbiotic Bacteria — Rhizobium [0.5]
They are called biofertilisers because these are the micro-organisms that enrich the nutrient quality of the soil. They help in fixing atmospheric nitrogen. [1]
Symbiotic Bacteria — Rhizobium [0.5]
They are called biofertilisers because these are the micro-organisms that enrich the nutrient quality of the soil. They help in fixing atmospheric nitrogen. [1]
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