Nitrogen Fixation Trivia Quiz

Questions : 10 | Total Attempts: 706 | Recent Updated: 14-Jun-2020
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Any process that causes free nitrogen (N2) to combine chemically with other elements to form more-reactive nitrogen compounds such as ammonia, nitrates, or nitrites. Atmospheric nitrogen is molecular dinitrogen, a relatively nonreactive molecule. More than 90 % percent of all nitrogen fixation is effected by microorganisms. Two kinds of nitrogen-fixing microorganisms are recognized: free-living (nonsymbiotic) bacteria, including the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium. Some symbiotic microorganisms are Rhizobium, associated with leguminous plants, and various Azospirillum species, associated with cereal grass.

Questions Excerpt


1. Name the German agronomist who discovered nitrogen fixation.

A. Hermann Hellriegel

B. Charles Darwin

C. Michael Faraday

D. John Brown

2. Name the Dutch microbiologist who discovered nitrogen fixation.

A. Charles Darwin

B. Martinus Beijerinck

C. Mary Martin

D. John Brown

3. Atmospheric nitrogen is converted to ammonia by an enzyme...

A. Hydrogenase

B. Nitrogenase

C. Bacillus

D. Enzymase

4. Nostoc and Anabaena are examples of which blue-green algae?

A. Cyanobacteria

B. Streptococcus

C. E coli

D. Salmonella

5. Symbiotic organisms are associated with....

A. Weeds of kharif

B. Cereal grasses

C. Pulse grass

D. None of these

6. Which of the following is the example of symbiotic bacteria?

A. Anabaena

B. Nostoc

C. Clostridium

D. Rhizobium

7. An example of free-living non-symbiotic Bacteria is...

A. Clostridium

B. Rhizobium

C. Nostoc

D. Azospirillum

8. 90% of the nitrogen is fixed by...

A. Industries

B. Soil microorganisms

C. Atmosphere

D. Chemical treatment

9. In the first stage of nitrogen fixation ammonia is converted into....

A. NO2

B. N2O

C. NH4

D. N2

10. In the last stage of nitrogen fixation ammonia is converted into....

A. N2

B. NH3

C. NO2

D. N2O

 

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