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Mineral Nutrition Test - 33

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Mineral Nutrition Test - 33
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  • Question 1
    1 / -0
    The deficiency of which mineral element leads to 'whiptail of Brassica'?
    Solution
    • Molybdenum is an important essential micronutrient. Its deficiency leads to mottled chlorosis with marginal infolding and necrosis, whiptail in crucifers, upper leaf half wither in monocots, loosening of cauliflower head, growth retardation, etc. 
    • Brassica is a genus of plants in the mustard family (Brassicaceae). The members of the genus are informally known as cruciferous vegetables, cabbages, or mustard plants. So, deficiency of Mo leads to whiptail in them.
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    Advantages of hydroponic cultures are that
    Solution
    Hydroponics is the art of growing plants in absence of soil in a nutrient medium of defined concentration. It was initiated by Von Sachs. The technique is useful because plants can be grown in a defined medium. Pests can be avoided and plants can be protected from floods and drought etc. Also plants can be protected from various soil and water pollutants. In future, when pressure on land increases due to population growth, hydroponics will emerge as highly useful technique.
  • Question 3
    1 / -0
    An element required for pollen germination is
    Solution
    Boron is an important micronutrient for plant. It is required for calcium metabolism, pollen germination, cell differentiation, carbohydrate transport, root nodulation, synthesis of pectin, proteins and nucleic acids, membrane functions, cell elongation and cell differentiation.
  • Question 4
    1 / -0
    Which amino acid contains sulphur
    Solution
    Proteins are polymers of amino acids. 20 amino acids occur in natural proteins. The amino acids are compounds made up of carbon, hydrogen, oxygen and nitrogen. Some amino acids also carry sulphur atoms. Methionine and cysteine are the sulphur containing amino acids.
  • Question 5
    1 / -0
    Lesions in the pith of stem and death of apical parts occur due to deficiency of
    Solution
    Boron is one of the micronutrients which is essential for the growth of plants. It helps to provide the structural integrity to the cell wall of the plant. Symptoms of boron deficiency include leaf midrib cracking, stem corkiness etc. The roots become rough and dwarfed, lessions appear in the pith. It's deficiency also results in the death of the apical plants. It's deficiency causes brown heart in radish and cauliflower, cracked stems of celery etc. 
    So the correct option is B.
  • Question 6
    1 / -0
    Protochlorophyll cannot be converted to chlorophyll in the absence of
    Solution
    Plants grown in absence of sunlight are termed as etiolated plants. These plants are long thin pale and do not have chlorophyll. They, however, have protochlorophyll. Elements required for chlorophyll biosynthesis are magnesium, iron and light. In absence of any of these, chlorophyll cannot be synthesized and protochlorophyll will accumulate in plants.
  • Question 7
    1 / -0
    Exanthema in citrus is caused due to deficiency of
    Solution
    Copper is an essential micronutrient for plants. Deficiency of copper may lead to diseases like dieback, exanthema, exuding gummy substances, apical necrosis of young leaves extending towards base along the margins (called as reclamation), blackening of potato tuber etc.
  • Question 8
    1 / -0
    Which of the following after absorption is stored in form of phytin or phytic acids in vegetative tissues and seeds?
    Solution
    • Phytin is a calcium magnesium salt of phytic acid, that occurs in plants as the main phosphorus storage reserve especially in seeds of cereals and legumes or tubers.

    So, the correct answer is option B.
  • Question 9
    1 / -0
    The first stable product of fixation of atmospheric nitrogen in leguminous plants is
    Solution

    Solution

    Correct answer is option A.

    Explanation for correct option

    • Biological nitrogen fixation is the process that helps nitrogen fixation in plants. 
    • This process is mediated in nature only by nitrogen-fixing bacteria.
    • Root nodules of leguminous plants harbour nitrogen-fixing bacterium, which has nitrogenase enzyme.
    • Ammonia is the first stable compound produced in the fixation of atmospheric nitrogen.

  • Question 10
    1 / -0
    Nitrogen metabolism is not possible in the absence of
    Solution
    Molybdenum is an important essential micronutrient. Molybdenum is an activator of certain enzymes involved in nitrogen metabolism including nitrate reduction and nitrogen fixation, ascorbic acid synthesis and other redox reactions.
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