Q. 1 A4.4( 9 Votes )
Rhizobium bacteria are associated with the fixation of
A. oxygen
B. carbon dioxide
C. nitrogen
D. water vapour.
Answer :
Plants cannot take nitrogen directly from soil but require it for the production of protein. Rhizobium bacteria help in the mobilization of nitrogen. It is thus used as a bio-fertilizer. They form a symbiotic association with the nodules of legumes. The legumes provide food and shelter to the bacteria and it, in turn, helps in fixation of nitrogen.
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