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Nitrogen

Rhizobium and...

Question

Rhizobium and Rhodospirillum

A

Fix nitrogen under symbiotic condition

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B

Are heterotrophic nitrogen fixers

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C

Involve strong reducing agent and ATP for $N_{2}$ - fixation

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D

Contain leg-haemoglobin as oxygen scavenger.

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Solution

The correct option is C
Involve strong reducing agent and ATP for $N_{2}$ - fixation

Rhodospirillum is purple non-sulphur bacteria.

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Similar questions

Q. During symbiotic nitrogen fixation, how many ATPs are used in fixing one mole of

N_{2}

.

Q. Name any one symbiotic nitrogen fixing bacteria. How does it help in nitrogen fixation ?

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.

Nitrogen fixing bacteria use oxygen for nitrogen fixation.

Q. Rhizobium phaseoli fixes atmospheric nitrogen symbiotically in

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