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Nitrogen Fixation

Rhizobium bac...

Question

Rhizobium bacteria fix nitrogen and are present in the roots of all plants.

A

True

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B

False

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Solution

The correct option is B
False

Rhizobium bacteria fix nitrogen and make it available to plants. However, they are not present in all plants. Some special plants such as peas and legumes contain these bacteria in special structures of their roots.

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Rhizobium bacteria fix nitrogen and are present in the roots of all plants. True or false?

Q. Name any one plant which has nitrogen fixing rhizobium bacteria in it's roots

Rhizobium is a nitrogen-fixing bacteria found in the roots of pulses and have a ___ relationship with them.

Q. Nitrogen fixing bacteria are present on root nodules of leguminous plants to fix nitrogen.

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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