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Nodule Formation

List of A) fr...

Question

List of
A) free living aerobic N2 fixing bacteria
B) free living anaerobic N2 fixing bacteria
C) symbiotic aerobic N2 fixing bacteria
D) symbiotic anaerobic N2 fixing bacteria

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Solution

Dear student,
A)The free-living aerobic N₂ fixing bacteria is Azotobacter.
B)The free-living anaerobic N2 fixing bacteria is Anabaena.
C)The symbiotic aerobic N2 fixing bacteria is Rhizobium.
D)The symbiotic anaerobic N2 fixing bacteria is Azospirillum.
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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.

Q. Which of the following is not an aerobic nitrogen fixing free living bacteria?

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