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Compost and Vermicompost

isn't rhizobi...

Question

isn't rhizobium a free-living nitrogen fixing bacteria in the soil?

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Solution

Rhizobium is free living in soil but as symbionts can fix atmospheric nitrogen. It forms symbiotic association with roots of legumes to fix nitrogen.

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R h i z o b i u m

is a nitrogen fixing soil bacteria.

Q. Rhizobium is a nitrogen fixing bacteria present in soil.

Q. Rhizobium is a free-living nitrogen-fixing bacterium.

Q. Which of the following is a free living nitrogen fixing bacteria present in the soil?

Refer the given passage and answer the following questions

At present, the primary nutrient which limits the agricultural yield is nitrogen (N). Some plants are capable to produce more

N_{2}

than they consume. These plants show a symbiotic relationship with

N_{2}

-fixing bacteria such as Rhizobium. These bacteria produce root nodules in leguminous plants and convert atmospheric

N_{2}

into nitrogenous compounds. Rhizobium bacteria are gram-negative bacteria, which show host specificity and fix

N_{2}

in the presence of a red pigment called leghaemoglobin. It protects nitrogen-fixing enzyme nitrogenase from oxygen.

Read the given statements and select the correct answer.

Statement 1: Rhizobium bacteria can also live freely in the soil and carry out

N_{2}

-fixation by themselves.
Statement 2: Such Rhizobium bacteria are called free-living

N_{2}

-fixing bacteria.

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