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Antibiotics

Azospirillium...

Question

Azospirillium and Azotobactor are examples for:

A

Decomposers

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B

Free-living N2 fixating bacteria

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C

Symbiotic N2 fixative

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D

Pathogens

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Solution

The correct option is B
Free-living N2 fixating bacteria

Azospirillium and Azotobactor are example of free-living nitrogen fixating bacteria. They are present in the root nodules of leguminous plants and help in fixing atmospheric nitrogen in the soil.

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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. Choose the correct matching set from the following.

	List I		List II
A	$A z o s p i r i l l u m$ and $A z o t o b a c t e r$	1	Free living nitrogen fixing bacteria
B	$G l o m u s$	2	Biological control tools
C	$A n a b a e n a$ and $N o s t o c$	3	Forms mycorrhiza
D	$N u c l e o p o l y h e d r o$ $v i r u s$	4	Symbiotic cyanobacteria

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

N_{2}

.

Q. Select the correct match
1. Nitrosomonas: Nitrifying bacteria
2. Rhizobia - Free-living nitrogen fixer
3. Nostoc: Free-living nitrogen fixer
4. Azotobacter: Symbiotic nitrogen fixer

Q. A free living anaerobic bacterium capable of

N_{2}

fixation in soil is

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