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Mineral Nutrition Test - 27

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Mineral Nutrition Test - 27
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  • Question 1
    1 / -0
    Boron is absorbed as
    Solution
    Boron is absorbed by the plants mainly as boric acid and also as borate ions. Boron is released by withering of rock minerals. Boron uptake is a passive process and is dependent on its concentration in soil solution. Thus its concentration in sea water is relatively high (5mg/l) than in fresh water (5mg/l).
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    Which one of the following elements plays an important role in biological nitrogen fixation?

    Solution
    Molybdenum is required for nitrogen fixation in plants. Nitrate metabolism depends upon enzyme nitrate reductase. It is an activator of nitrate reductase. therefore, the element is important for nitrogen fixation.
  • Question 3
    1 / -0
    Grey speck disease in oats takes place by the deficiency of
    Solution
    Grey speck disease of oat and barley is a non pathogenic deficiency disease. It occurs due to deficiency of manganese. In the case of severe deficiency, the crop can die completely.
  • Question 4
    1 / -0
    Which one of the following nutrient serves as micro elements for plant growth?

    Solution
    Molybdenum, copper and zinc are important micronutrients required by plants. Molybdenum is required for nitrogen fixation. Copper is required for activity of enzymes like nitrite reductase and electron transport proteins in photosynthesis. Zinc is required for auxin biosynthesis and activity of enzymes like alcohol dehydrogenase.
  • Question 5
    1 / -0
    The plants accept Zn as
    Solution
    Most of the mineral ions are absorbed in charged ionic form. In soil the charged ions are adsorbed on clay particles. Hence, zinc is absorbed as positively charged divalent form.
  • Question 6
    1 / -0
    'Petiole crack' is caused by the deficiency of
    Solution
    In Mangold plant, rotting of crown and rough condition of petiole epidermis is due to boron deficiency. Petioles of leaves show cracking of epidermis on upper surfaces in typical case of 'crown rot'. So, petiole crack is caused due to deficiency of boron.
  • Question 7
    1 / -0
    Inorganic element that changes food into usable energy is
    Solution
    A biologically useful form of energy is the Adenosine triphosphate or ATP. The ATP is biochemically a nucleotide. It is the phosphoric acid ester of a nucleoside called adenosine. The ATP is produced by a process of phosphorylation. Plants carry out the phosphorylation process in the presence of sunlight. This process is called photophosphorylation. Animal cells (and also plant cells during respiration) carry out phosphorylation during oxidation of food. This process is called oxidative phosphorylation. Hence, The correct answer is option B.
  • Question 8
    1 / -0
    Browning of cauliflower takes place due to deficiency of which one of the following elements?
    Solution
    Browning of cauliflower is due to boron deficiency.
  • Question 9
    1 / -0
    Which of the following is the importance of molybdenum in plant metabolism?
    Solution
    Molybdenum is an essential micronutrient required for nitrogen metabolism. The enzyme of root nodule bacteria as well as nitrogen assimilation plant enzymes require molybdenum.
  • Question 10
    1 / -0
    Function of zinc is
    Solution
    Zinc is an important essential micronutrient. Zinc is required for the activity of carbonic anhydrase, auxin (Indole acetic acid, IAA) biosynthesis. Zinc is also an activator of certain carboxylases and dehydrogenases. It has also been reported that zinc deficiency induces oxidative environment, which results in degradation of auxin.
    Thus, the correct answer is option B.
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