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Mineral Nutrition Test - 23

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Mineral Nutrition Test - 23
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  • Question 1
    1 / -0
    The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted, because they are usually found as
    Solution
    Clay particles have a negative charge, so the positively charged mineral ions are adsorbed on clay particles and not easily lost but negatively charged mineral ions can be easily lost as they are not adsorbed on soil particles. 
    Both nitrogen and phosphorous are absorbed in negatively charged ionic form i.e., hydrogen phosphate and dihydrogen phosphate and nitrate ion form. Hence, the source of nitrogen and phosphorous can be easily depleted in soil.
    So, the correct answer is 'Negatively charged ions'
  • Question 2
    1 / -0
    Which of the following is not essential macro-element for the growth of plants?
    Solution
    • Zinc is an essential micronutrient required for the activity of enzymes like alcohol dehydrogenase and carbonic anhydrase and for auxin biosynthesis.
    • N, Ca and K are essential macronutrients involved in the growth of plants.
  • Question 3
    1 / -0
    Plants absorb phosphorus as
    Solution
    Plants absorb phosphorus as phosphates, which includes both dihydrogen phosphate and hydrogen phosphate form.
  • Question 4
    1 / -0
    Deficiency of which of the following element cause weakening of pedicel and petiole?
    Solution
    Calcium is an important constituent of plant cell walls. Calcium in the form of calcium pectate is required to form middle lamella between plant cells. Deficiency of calcium will lead to weakening of pedicel and petioles.
  • Question 5
    1 / -0
    Which of the following required for binding protein with nucleic acid?
    Solution

    Many enzymes acting on DNA require Mg2+ ions not only for catalysis but also to bind DNA. Ca2+ acts as a substitute for Mg2+ to promote DNA binding. The Sfi-1 endonuclease requires divalent metal ions to bind DNA but, in contrast to many systems where Ca2+ mimics Mg2+, Ca2+ causes Sfi-1 to bind DNA almost irreversibly. Hence the correct option is D.

  • Question 6
    1 / -0
    The mineral present in the cell wall is
    Solution
    Calcium is found in association with pectin in middle lamellae as calcium pectate. Other mineral elements given are not important for plant cell wall but have other important roles.
  • Question 7
    1 / -0
    Which one is not related to plant ash?
    Solution
    Plant ash is the residue left, when a plant is burnt. Nitrogen is readily oxidisable element and during burning it will be converted to oxides and hence, will not be present in ash.
  • Question 8
    1 / -0
    Magnesium is mainly present in the form of
    Solution
    Magnesium is mainly present as carbonate and is adsorbed on the surfaces of clays and organic matter. Magnesium is present in the soil solution and, is absorbed as the exchangeable cation $$Mg^{2+}$$.
  • Question 9
    1 / -0
    In plants, sulphur is found as
    Solution
    In plants, sulphur is found as moving nutrient as it needs to circulate to various parts of the plants. It is absorbed from the soil as sulphates and used in the production of amino acids. It forms an integral component of the vitamins. It reduces the content of sodium in the soil so it is also known as a soil conditioner. It is used for the formation of chlorophyll. It plays an active role in the nitrogen metabolism.
    So, the correct answer is option B. 
  • Question 10
    1 / -0
    Which of the following element is very essential for uptake and utilization of $$Ca^{2+}$$ and membrane function?
    Solution
    Boron is the mineral element required for uptake and utilization of calcium. Thus deficiency symptoms in plants should be interpreted with care. For example the deficiency symptoms of calcium and boron will be similar
    So, the correct answer is 'Boron'
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