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Mineral Nutrition Test - 35

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Mineral Nutrition Test - 35
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  • Question 1
    1 / -0
    The insectivorous plants can grow well in the soil  deficient of which mineral
    Solution
    The insectivorous plants are those that trap insects and use them as the source of nitrogen. Thus, the insectivorous plants can grow in nitrogen-deficient soil. These plants trap insects to supplement their nitrogen requirement and not as the source of food. The insectivorous plants are autotrophic and synthesize their own food.
  • Question 2
    1 / -0
    Who gave the criteria of essentiality?
    Solution
    The criteria of essentiality was stated by Arnon and Stout. According to the criteria of essentiality, an essential element is one which is indispensable for completion of the life cycle in a deficiency of which plants may not set seeds, the element cannot be substituted by any other element and the element must be directly involved in the plant metabolism. The deficiency of element will lead to the development of deficiency symptom.
    So, the correct answer is option D.
  • Question 3
    1 / -0
    Which element is essential for root hair formation?
    Solution
    Calcium is an essential macronutrient. Calcium is required for formation calcium pectate in middle lamella, development of root and stem apices, development and elongation of root hairs, cell membrane permeability, activator of some enzymes and organisation of mitotic spindle.
  • Question 4
    1 / -0
    Insectivorous plants are usually those which survive in
    Solution
    Insectivorous plants are photosynthetic plants growing in nitrogen deficient soils. Hence, they have evolved various mechanisms for trapping insects, which are used to supplement the nitrogen requirement of these plants.
  • Question 5
    1 / -0
    The premature leaf fall is due to deficiency of
    Solution
    Phosphorous is an essential macronutrient. It is required for biosynthesis of nucleotides, nucleic acids, phospholipids etc. Its deficiency leads to poor growth, dull green leaves, red anthocyanin spots, premature leaf fall, premature fall of flower buds and delayed seed germination.
  • Question 6
    1 / -0
    Leguminous plants are able to fix atmospheric nitrogen through the process of symbiont nitrogen fixation. Which one of the following statements is not correct about this process?
    Solution
    Plants do not directly absorb atmospheric nitrogen. In nature, a nitrogen cycle is operational, which continuously shuttles nitrogen between the living and non-living components of the ecosystem. 
    Nitrogen fixation is the process of converting inert atmospheric nitrogen into utilisable compounds, like nitrate and ammonia. 
    Rhizobium is symbiotic nitrogen fixer found in the root nodules of legume plants. It contains the enzyme nitrogenase, which carries out the process of nitrogen fixation using reduced substrates from the host plant. 
    The enzyme nitrogenase is highly sensitive to free oxygen and hence, root nodules carry the reddish (or pinkish) pigment leghemoglobin, which binds free oxygen and thus protects nitrogenase.
    So, the correct answer is option D.
  • Question 7
    1 / -0
    If by radiation, all nitrogenase enzymes are inactivated, then there will be no
    Solution
    Atmospheric nitrogen is diatomic nitrogen. It is not useful for plants. Conversion of atmospheric nitrogen into plant usable form like nitrate, nitrite and ammonium ions is called nitrogen fixation. Nitrogenase enzyme carry out nitrogen fixation by converting free nitrogen into ammonia.
  • Question 8
    1 / -0
    Which one of these minerals is not an essential element for plants?
    Solution
    Plants require 17 essential minerals for optimum growth. According to the quantity required these essential minerals can be grouped into two classes- 9 macronutrients (carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, sulphur, calcium, magnesium) required in large quantity and 8 micronutrients (iron, molybdenum, boron, chlorine, zinc, nickel, copper, manganese) required in smaller quantity. 
    Other than these 17 essential minerals plants also absorb a number of non essential minerals. These minerals are absorbed non specifically, because they happen to be present in soil solution and are swept with the water current to inside the plant. 
    Cadmium is a non essential mineral not required by plants but may be present in plant ash. In fact cadmium is a heavy metal pollutant and is harmful to plants.
  • Question 9
    1 / -0
    'Dieback' of citrus and 'reclamation' of legumes and cereals is due to deficiency of
    Solution
    Copper is an important essential micronutrient for plants. Its deficiency leads to dieback, exanthema exuding gummy substance, apical necrosis of young leaves extending towards base along the margins (i.e., reclamation disease), blackening of potato etc.
  • Question 10
    1 / -0
    Which of the following is required in maximum amount for plant growth?
    Solution
    Nitrogen is an essential macronutrient. It is the mineral required by plants in largest quantity. It is required for synthesis of nucleotides, nucleic acids, amino acids, protein biosynthesis, enzymes etc. Nitrogen is frequently deficient in soil. Hence, is frequently applied to soil as nitrogenous fertilizer.
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