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Question

Identify the bacteria found in root nodules of leguminous plants


A
Escherichia Coli
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B
Rhizobium
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C
Azotobacter 
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D
Granulobacter 
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Solution

The correct option is C Rhizobium
Root nodules are present in those plant roots which has a symbiotic association with nitrogen-fixing bacteria. This relationship is very common in nitrogen-limited conditions. A specific strain of bacteria known as rhizobia converts nitrogen gas from the atmosphere to ammonia which is then used in the formation of amino acids and nucleotides. Whereas acetobacter is a free-living nitrogen-fixing bacteria. E-coli live in the intestine and Granulobacter is associated with fermentation of pentose. 
So the correct answer is 'rhizobium'.

Biology

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