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Question

Choose the correct definition for “Rhizobium bacteria”.



Your Answer
A

The bacteria found in the intestines of animals which help in the digestion of cellulose present in their feed

Your Answer
B

Bacteria which are used in sewage works to break down the organic matter in sewage and make it harmless

Correct Answer
C

The nitrogen-fixing bacteria present in root nodules of leguminous plant convert atmospheric nitrogen gas into nitrogenous compound

Your Answer
D

Bacteria that makes curd from milk


Solution

The correct option is C

The nitrogen-fixing bacteria present in root nodules of leguminous plant convert atmospheric nitrogen gas into nitrogenous compound


In a symbiotic relationship with the soil , bacteria known as 'rhizobia', legumes form nodules on their roots  to 'fix' nitrogen into a form usable by plants and animals.

Rhizobia  fix atmospheric nitrogen or dinitrogen, N2  , into inorganic nitrogen compounds, such as ammonium, NH4 ions , which is then incorporated into amino acids, which can be utilized by the plant. Plants cannot fix nitrogen on their own, but need it in one form or another to make amino acids and proteins. Because legumes form nodules with rhizobia, they have high levels of nitrogen available to them. Their abundance of nitrogen is beneficial not only to the legumes themselves, but also to the plants around them. There are other sources of nitrogen in the soil, but are not always provided at the levels required by plants, making the symbiotic relationship between legumes and rhizobia highly beneficial. In return for the fixed nitrogen that they provide, the rhizobia are provided shelter inside of the plant's nodules and some of the carbon substrates and micronutrients that they need to generate energy and key metabolites for the cellular processes that sustain life 

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