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Manure/Fertilizers

Atmospheric n...

Question

Atmospheric nitrogen does not get fixed through:

A

Action of plants

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B

Rhizobium bacteria

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C

Clostridium bacteria

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D

Action of lightning

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Solution

The correct option is A
Action of plants

Plants cannot fix atmospheric nitrogen directly.

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Similar questions

Q. Atmospheric nitrogen is fixed by __________.
(a) lightning
(b) blue-green algae
(c) bacteria present in the root nodules of leguminous plants
(d) all the above

Q. What is the function of nitrogen fixing bacteria like Rhizobium?

Name any one plant which has nitrogen fixing rhizobium bacteria

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

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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