Which of the following statements is false?

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(D) The correct answer is $D$. $1$. $Anabaena$ is an autotrophic cyanobacterium capable of nitrogen fixation. $2$. Cyanobacteria,such as $Anabaena$ an

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Rhizobium bacteria are free-living.

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(D) The correct answer is $D$. $1$. $Anabaena$ is an autotrophic cyanobacterium capable of nitrogen fixation. $2$. Cyanobacteria,such as $Anabaena$ and $Nostoc$,are widely used as biofertilizers in paddy fields to enhance soil fertility. $3$. Blue-green algae (cyanobacteria) add organic matter to the soil and increase its fertility. $4$. $Rhizobium$ is a symbiotic bacterium that lives in the root nodules of leguminous plants,not a free-living bacterium. Therefore,the statement that $Rhizobium$ is free-living is false.

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