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Mineral Nutrition Test - 19

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Mineral Nutrition Test - 19
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  • Question 1
    1 / -0
    Molybdenum is involved in
    Solution
    Molybdenum is involved in nitrogen fixation as well as reduction of nitrates as both of these steps are carried out by enzymes nitrogenase and nitrate reductase respectively in which the key elements present is molybdenum only.
    For chlorophyll synthesis, Mg & Fe are required.
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    Which of these is a free living aerobic and anaerobic nitrogen-fixing bacteria respectively?
    Solution
    • The bacteria that convert atmospheric nitrogen into utilizable compounds of nitrogen like nitrate, ammonia, etc. are known as nitrogen-fixing bacteria.
    • They possess nitrogenase enzyme which helps them in nitrogen fixation. These bacteria are either free-living or in a symbiotic relationship with the roots of the plants.
    • Azotobacter and Clostridium are free-living nitrogen-fixing bacteria. Azotobacter is aerobic because it can strictly live only in the presence of oxygen, whereas Clostridium is anaerobic because its growth is not strictly dependent on the presence of oxygen.
    • So, the correct answer is option B.
  • Question 3
    1 / -0
    Enzyme required for nitrogen fixation is
    Solution
    The fixation of nitrogen in root nodules of legumes takes place in the presence of the enzyme nitrogenase. This enzyme is an enzyme complex consisting of two components called protein 1 and protein 2. The active nitrogenase complex contains protein 1 and protein 2 components in the ratio of 1:2.
    So, the correct answer is option A. 
  • Question 4
    1 / -0
    Chlorosis, i.e., loss of chlorophyll leading to yellowing in leaves, is caused by the deficiency of 
  • Question 5
    1 / -0
    Yellowish edges appear in leaves deficient in
  • Question 6
    1 / -0
    Deficiency symptoms tend to appear first in ________ whenever the essential elements are relatively immobile and are not transported out of the mature organs.
  • Question 7
    1 / -0
    Premature leaf fall is due to deficiency of 
  • Question 8
    1 / -0
    Which of the following is a free-living nitrogen fixing bacterium present in the soil?
    Solution
    Free-living nitrogen-fixing microbes are :
    • Azotobacter
    • Beijernickia 

    So the correct option is "Azotobacter". 
  • Question 9
    1 / -0
    Identify the plant among these, having nitrogen fixing bacteria
    Solution
    Symbiotic nitrogen fixation generally takes place commonly in legumes as non-legumes plants. Roots of leguminous plants like gram are associated with Rhizobium that is involved in nitrogen fixation. 
    Thus, the correct answer is option C. 
  • Question 10
    1 / -0
    Deficiency symptoms of radially mobilised essential elements will first appear in _________
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