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Mineral Nutrition Test - 44

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Mineral Nutrition Test - 44
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Bacteria that convert ammonia to nitrite belongs to ______________.
  • Question 2
    1 / -0
    The major role of minor elements inside living organisms is to act as ______________.
    Solution
    Answer is option A i.e. "Co-factors of Enzymes"
    Micro-elements work as non-protein cofactor in enzymes. Zn, Cu, Fe, Mg, Mn, etc are some mineral elements which acts as a cofactor. These ions attach to the enzyme and activate the enzyme. It brings a conformational change in the structure of an enzyme which eventually accelerate the reaction.
  • Question 3
    1 / -0
    Bacteria present in root nodules of the leguminous plants are
    Solution
    Leguminous plants belong to the family Fabaceae. These plants have a symbiotic association with the soil bacteria called the Rhizobium, that live in their roots, forming root nodules and fix atmospheric nitrogen into the nitrates and nitrites for the plants and in turn, the plants provide the nutrition to the bacteria.
    A. Rhizobium is the nitrogen-fixing bacteria living in symbiotic association with leguminous plants.
    B. Lactobacillus is used in curdling of the milk.
    C. Cyanobacteria are free-living, photosynthetic, nitrogen-fixing bacteria
    D. Azotobacter is free-living, nitrogen-fixing bacteria.
    Hence, the correct answer is 'Rhizobium'.
  • Question 4
    1 / -0
    Ecosystems obtain nitrogen from outside through the process of
    Solution
    All the three processes are vital for giving back nitrogen to the atmosphere and for the movement of the Nitrogen cycle. 
    Industrial and electrochemical fixation generally consists of chemical ways of the release of nitrogen which sometimes can be a by-product too.
    In biological fixation, enzymes are used to carry out the reactions biologically.
    So the correct answer is 'All of the above'.
  • Question 5
    1 / -0
    Which one is wrong statement?
    Solution
    Answer: (B) Plants absorb nitrate ions and convert it into N$$_2$$ for amino acid synthesis.
    Explanation:
    • Leghaemoglobin is found in the root nodules of leguminous plants.
    • It helps in facilitating oxygen transport to the nitrogen-fixing bacteria.
    • It also protects the enzyme nitrogenase from being activated by oxygen.
    • During photorespiration, side products are formed and these are metabolized by the peroxisomes.
    • The first step of carbon fixation is performed by C4 plants with the help of the PEP case enzyme.
    • Nitrates are first converted into nitrites and then it converts into ammonia which is further used for amino acid synthesis. 
    Hence, Plants absorb nitrate ions and convert them into N$$_2$$ for amino acid synthesis in the incorrect option.
  • Question 6
    1 / -0
    Ammonification in the nitrogen cycle is brought about by the activity of
    Solution
    • Rhizobium converts atmospheric nitrogen into organic nitrogenous (ammonium) compounds which increases soil fertility.
    • Nitrosomonas is a bacterium that converts ammonium ions or ammonia into nitrites, while Nitrobacter is a bacterium that converts nitrite into nitrates in the soil.
    • Pseudomonas helps in the reduction of nitrates back into nitrogen gas ($$N_2$$) through denitrification.
    So, the correct answer is option B.
  • Question 7
    1 / -0
    Coralloid roots help the plant in
    Solution
    Coralloid roots help in fixation of nitrogen as it contain symbiotic cyanobacteria also known as blue-green algae, which helps in fixation and in association with root tissues, produce such beneficial amino acids as asparagine and citrulline.
    So, the correct answer is option B.
  • Question 8
    1 / -0
    The symbiotic nitrogen fixing bacterium in root nodules of legumes is
    Solution
    Rhizobium fixes nitrogen in symbiotic association with roots of leguminous plants. Initially, the bacteria grow in soil near the roots of higher plants where they fail to fix the nitrogen. These bacteria when coming in contact with leguminous plants, interact chemically and enter into roots through root hairs, and fix nitrogen by symbiotic association. Thus, the correct answer is option C.
  • Question 9
    1 / -0
    In paddy fields biological nitrogen fixation is chiefly brought by ______________.
    Solution
    A.Correct option -A

    B.Explanation for correct option -A
    ●Rhizobium is a soil bacteria that fixes nitrogen belonging to the genus of gram-negative bacteria. 
    ●Rhizobium species from endosymbiotic nitrogen-fixing associations with legumes.
    ●EX-Cyanobacteria which is also called blue green algae .
  • Question 10
    1 / -0
    Nitrification includes

    (a) Oxidation of ammonia to nitrite
    (b) Oxidation of nitrite to nitrate
    Solution
    Nitrification is a biological oxidation of ammonia or ammonia to nitrite followed by oxidation of nitrite to nitrate.
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