Nitrogen Fixation Quiz: Trivia Questions!

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Nitrogen Fixation
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Nitrogen Fixation Quiz: Trivia Questions! - Quiz

Do you know anything about nitrogen fixation? It is a procedure by which molecular nitrogen in the air is converted into ammonia or related nitrogenous soil compounds. Nitrogen fixation is crucial to life because fixed inorganic nitrogen compounds are necessary for all nitrogen biosynthesis containing organic compounds such as amino acids and proteins, nucleoside triphosphates, and nucleic acids. If you need to learn about nitrogen fixation, this quiz can help.


Questions and Answers
  • 1. 

    N and P are nutrients substances required by the microorganism to survive. N is a limiting factor and depletion due to?

    • A.

      Microbial denitification, soil erosion and chemical volatilization

    • B.

      Chemical volatilization and Chemical development

    • C.

      Soil erosion and suspension

    • D.

      Microbial denitrification and microbial nitrification

    Correct Answer
    A. Microbial denitification, soil erosion and chemical volatilization
    Explanation
    The depletion of nutrient N is caused by microbial denitification, soil erosion, and chemical volatilization. Microbial denitification refers to the process in which microorganisms convert nitrate (NO3-) into nitrogen gas (N2) and release it into the atmosphere. Soil erosion can lead to the loss of nutrients, including N, from the soil. Chemical volatilization involves the release of N in the form of gas into the atmosphere through various chemical processes. Therefore, these factors contribute to the depletion of nutrient N.

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  • 2. 

    Nitrogen in agricultural soil can be replaced by?

    • A.

      Commercial inorganic fertilizers

    • B.

      Commercial organic fertilizer

    • C.

      Home ­ made fertilizer

    • D.

      Systematic nitrogen fixation (SNF) system

    Correct Answer
    A. Commercial inorganic fertilizers
    Explanation
    Commercial inorganic fertilizers can replace nitrogen in agricultural soil. Inorganic fertilizers are typically made from synthetic materials and contain nitrogen compounds such as ammonium nitrate or urea. When these fertilizers are applied to the soil, the nitrogen is readily available for plants to uptake and use for growth and development. This is an effective way to replenish nitrogen levels in the soil and ensure that crops have an adequate supply of this essential nutrient.

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  • 3. 

    Nitrogen fixation is a process of reducing nitrogen gas into ammonia by the microorganism. What is/are the microorganism that able to fix nitrogen?

    • A.

      Staphylococcus aureus

    • B.

      Escherichia coli and Enterobacter aerogenes

    • C.

      Azotobacter vialandii and Cyanobacteria

    • D.

      Salmonella

    Correct Answer
    C. Azotobacter vialandii and Cyanobacteria
    Explanation
    Nitrogen fixation is the process by which nitrogen gas is converted into a usable form, such as ammonia, by certain microorganisms. Azotobacter vialandii and Cyanobacteria are both known to have the ability to fix nitrogen. Staphylococcus aureus, Escherichia coli and Enterobacter aerogenes, and Salmonella are not typically associated with nitrogen fixation.

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  • 4. 

    In nitrogen fixation, what is/are the important requirement to complete this mechanism?

    • A.

      It requires oxygen and tremendous energy

    • B.

      It requires oxygen to initiate the process

    • C.

      It requires nitrogenase and tremendous energy 

    • D.

      It requires less energy at the beginning and high energy at the end of the process

    Correct Answer
    C. It requires nitrogenase and tremendous energy 
    Explanation
    Nitrogen fixation is the process of converting atmospheric nitrogen into a form that can be used by plants and other organisms. The enzyme nitrogenase is essential for this process as it facilitates the conversion of nitrogen gas into ammonia. Additionally, the process of nitrogen fixation requires a significant amount of energy to break the strong bonds between nitrogen molecules. Therefore, the correct answer is that nitrogen fixation requires nitrogenase and tremendous energy.

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  • 5. 

    Nitrosomonas and Nitrobacter can be put in which group of microbial nutrition? 

    • A.

      Chemolitotroph

    • B.

      Chemoorganotroph

    • C.

      Photolitotroph

    • D.

      Photoorganotroph

    Correct Answer
    A. Chemolitotroph
    Explanation
    Nitrosomonas and Nitrobacter are classified as chemolithotrophs because they obtain energy by oxidizing inorganic compounds and use them as a source of electrons. In this case, they oxidize ammonia and nitrite, respectively, to obtain energy. Chemolithotrophs are able to derive energy from inorganic compounds and do not require organic compounds for their metabolism.

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  • 6. 

    During denitrification, Nitrate is converted into gaseous nitrogen and nitrous oxide under the?

    • A.

      Anaerobic condition

    • B.

      Aerobic condition

    • C.

      Strict aerobic condition

    • D.

      Aerotolerant condition

    Correct Answer
    A. Anaerobic condition
    Explanation
    During denitrification, nitrate is converted into gaseous nitrogen and nitrous oxide. This process occurs under anaerobic conditions, meaning in the absence of oxygen. In anaerobic conditions, certain bacteria use nitrate as an electron acceptor in their metabolic process, converting it into nitrogen gas and nitrous oxide. This process is important in the nitrogen cycle as it helps to remove excess nitrogen from ecosystems.

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  • 7. 

    Nitrogenase is an enzyme that very sensitive to oxygen. What are the proteins that use to compose this enzyme?

    • A.

      Fe and Zn protein

    • B.

      MoFe and Fe protein

    • C.

      MoFe and Mn protein

    • D.

      All above are incorrect

    Correct Answer
    B. MoFe and Fe protein
    Explanation
    Nitrogenase is an enzyme that is very sensitive to oxygen. It is composed of MoFe and Fe proteins. The MoFe protein contains molybdenum and iron, while the Fe protein contains only iron. These proteins work together to catalyze the conversion of atmospheric nitrogen into a form that can be used by organisms. Fe and Zn protein, MoFe and Mn protein, and all the above options are incorrect because they do not accurately represent the proteins that compose nitrogenase.

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  • 8. 

    The classification of nitrogen fixation.

    • A.

      Symbiotic nitrogen fixation

    • B.

      Para symbiotic nitrogen fixation

    • C.

      Mixed symbiotic nitrogen fixation

    • D.

      Non symbiotic nitrogen fixation

    Correct Answer(s)
    A. Symbiotic nitrogen fixation
    D. Non symbiotic nitrogen fixation
    Explanation
    The correct answer includes both symbiotic nitrogen fixation and non-symbiotic nitrogen fixation. Symbiotic nitrogen fixation refers to the process in which certain plants form a mutualistic relationship with nitrogen-fixing bacteria, such as legumes and rhizobia. Non-symbiotic nitrogen fixation, on the other hand, occurs in free-living bacteria and archaea that can fix nitrogen without the need for a symbiotic relationship with plants. This classification helps to categorize the different mechanisms by which nitrogen fixation occurs in nature.

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  • 9. 

    Examples of diazotrophs?

    • A.

      Rhizobium

    • B.

      Azorhizobium

    • C.

      Chlorobium

    • D.

      Bradyrhizobium

    Correct Answer(s)
    A. Rhizobium
    B. Azorhizobium
    D. Bradyrhizobium
    Explanation
    The given examples of diazotrophs are Rhizobium, Azorhizobium, and Bradyrhizobium. Diazotrophs are organisms that have the ability to fix atmospheric nitrogen into a usable form for plants. Rhizobium is a genus of bacteria that forms a symbiotic relationship with leguminous plants, helping them to fix nitrogen. Azorhizobium is another genus of nitrogen-fixing bacteria that can form a symbiotic relationship with legumes. Bradyrhizobium is a genus of bacteria that also forms a symbiotic relationship with legumes and contributes to nitrogen fixation. These examples demonstrate the diversity of diazotrophs and their important role in nitrogen cycling.

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  • 10. 

    Haber­Bosch process?

    • A.

      Directly synthesize ammonia from H and N

    • B.

      Production pressure at 200­400 atm

    • C.

      Sometimes, the production pressure can be done at 100­199 atm.

    • D.

      Method was translated to large scale process.

    Correct Answer(s)
    A. Directly synthesize ammonia from H and N
    B. Production pressure at 200­400 atm
    D. Method was translated to large scale process.
    Explanation
    The Haber-Bosch process is a method used to directly synthesize ammonia from hydrogen (H) and nitrogen (N). The production pressure for this process is typically maintained at 200-400 atm, although it can sometimes be done at 100-199 atm. This method has been successfully translated to a large-scale process, allowing for the mass production of ammonia.

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  • 11. 

    Microorganisms that able to fix nitrogen are diazotrophs, cyanobacteria, azotobacteraceae, rhizobia and Frankia.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The statement is true because diazotrophs, cyanobacteria, azotobacteraceae, rhizobia, and Frankia are all known to be microorganisms that have the ability to fix nitrogen. These organisms have specialized enzymes that convert atmospheric nitrogen into a form that can be used by plants for their growth and development. Nitrogen fixation is an important process in the nitrogen cycle and is crucial for maintaining soil fertility and supporting plant growth.

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  • 12. 

    Association of rhizobia and plant is specific (mutual recognition between partners).

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The statement is true because the association between rhizobia and plants is specific and involves mutual recognition between the two partners. Rhizobia are a group of bacteria that form a symbiotic relationship with leguminous plants, such as peas and beans. They colonize the roots of these plants and form specialized structures called nodules, where they convert atmospheric nitrogen into a usable form for the plant. This association is specific because different species of rhizobia can only form nodules on specific species of leguminous plants. The recognition and interaction between rhizobia and plants are essential for the successful establishment of this symbiotic relationship.

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  • 13. 

    During modulation, tryptophan secreted by plant root is not metabolized to indoleacetic acid (IAA) by rhizobia.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    During modulation, tryptophan secreted by plant root is metabolized to indoleacetic acid (IAA) by rhizobia. This is because rhizobia have the ability to convert tryptophan into IAA, which is a plant growth hormone. This process helps in promoting root development and overall plant growth. Therefore, the statement that tryptophan is not metabolized to IAA by rhizobia during modulation is false.

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  • 14. 

    Flavonoids or isoflavonoids secreted by host plants induce expression of nodulation genes in rhizobial bacteria.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Flavonoids or isoflavonoids are compounds secreted by host plants that play a crucial role in the process of nodulation. These compounds act as signaling molecules and are responsible for inducing the expression of nodulation genes in rhizobial bacteria. This interaction between the plants and bacteria is essential for the formation of nitrogen-fixing nodules on the roots of leguminous plants. Therefore, the statement that flavonoids or isoflavonoids secreted by host plants induce expression of nodulation genes in rhizobial bacteria is true.

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  • 15. 

    Nitrate (NO3­) pollution will not cause methemoglobinemia.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Nitrate (NO3-) pollution can indeed cause methemoglobinemia. Methemoglobinemia is a condition where the iron in hemoglobin is oxidized, leading to a reduced ability of the blood to carry oxygen. Nitrate can be converted to nitrite (NO2-), which can then react with hemoglobin and convert it to methemoglobin. This can result in symptoms such as shortness of breath, fatigue, and cyanosis (bluish discoloration of the skin). Therefore, the statement that nitrate pollution will not cause methemoglobinemia is false.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 01, 2015
    Quiz Created by
    Nitrogen Fixation
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