Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D –

 

A

B

C

D

1. 

Nitri-

fication

Ammoni-

fication

Animals

Plants

2.

Denitri-

fication

Ammon-

ification

Plants

Animals

3. 

Nitri-

fication

Denitri-

fication

Animals

Plants

4. 

Denitri-

fication

Nitrif-

ication

Plants

Animals

 

Subtopic:  Nitrogen Fixation |
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Which one of the following is not a nitrogen-fixing organism?

1. Anabaena

2. Nostoc

3. Azotobacter

4. Pseudomonas

Subtopic:  Nitrogen Fixation |
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The below reaction depicts

1. Reductive amination

2. Transamination

3. Action of enzyme nitrogenise

4. Formation of amide

Subtopic:  Nitrogen Fixation |
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Nitrogen-fixing nodules on the roots of non-leguminous plants like Alnus are produced by
1. Rhizobium
2. Beijernickia
3. Azotobacter
4. Frankia

Subtopic:  Nitrogen Fixation |
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Which of the following bacteria reduce nitrate in soil into nitrogen ?

1. Nitrobacter

2. Thiobacillus

3. Nitrococcus

4. Nitrosomonas

Subtopic:  Nitrogen Fixation |
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Select the mismatch.

(1) Frankia                      Alnus

(2) Rhodospirillium            Mycorrhiza

(3) Anabaena                   Nitrogen fixer

(4) Rhizobium                 Alfa-fa

Subtopic:  Nitrogen Fixation |
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The free-living, anaerobic nitrogen-fixer is

1. Beijerinckia

2. Rhodospirillum

3. Rhizobium

4. Azotobacter

Subtopic:  Nitrogen Fixation |
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An organism used as a biofertilizer for raising soyabean crop is

1. Azospirillum

2. Rhizobium

3. Nostoc

4. Azotobacter

Subtopic:  Nitrogen Fixation |
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A nitrogen fixing microbe associated with Azolla in rice fields is

1. Spirulina

2. Anabaena

3. Frankia

4. Tolypothrix

Subtopic:  Nitrogen Fixation |
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Which of the folowing is a symbiotic nitrogen fixer?

1. Glomus

2. Azotobacter

3. Frankia

4. Azolla

Subtopic:  Nitrogen Fixation |
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