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Mineral Nutrition Test - 65

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Mineral Nutrition Test - 65
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  • Question 1
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    Select the incorrectly matched pair
    Solution
    Correct Option: A
    Explanation:
    • Plants absorb it in the form of divalent Mg2+. 
    • It stimulates the enzymes involved in respiration, photosynthesis, and DNA and RNA production. 
    • Magnesium is a component of chlorophyll's ring structure and aids in the preservation of the ribosome structure.
    • Formation of mitotic spindle is the characteristic feature of element Calcium so if there is deficiency of calcium then there would be no formation of mitotic spindle.
    Hence, incorrectly matched pair is magnesium (Mg) - Formation of mitotic spindle.
  • Question 2
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    The process of conversion of atmospheric free $$N_2$$ gas to nitrogenous compounds like $$NH_3$$ is termed as 
  • Question 3
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    Deficiency of which of the following elements delay flowering in plants?
    Solution
    • Nitrogen: an overabundance of nitrogen can delay flowering while a deficiency can reduce yield.
    • Molybdenum is a structural component of the enzyme that reduces nitrates to ammonia. Without it, the synthesis of proteins is blocked and plant growth ceases.
    • Sulfur is a structural component and is required for the production of chlorophyll.
    So, the correct answer is "$$N, S, Mo$$."
  • Question 4
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    Which of the following is not a deficiency symptom of minerals?
  • Question 5
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    Select the correct statement regarding manganese toxicity.
    Solution
    Manganese is a micronutrient which are required by the leaves and seeds. Manganese deficiency causes brown spots surrounded by chlorotic veins. Inhibition of calcium translocation in the shoot apex. Induction deficiencies of Mg and Fe.
    So, the correct answer is option D.
  • Question 6
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    While in N, K and Mg deficiency, chlorosis appears first in _____ leaves; in S and Ca deficiency,_____ leaves are the first to be affected.
    Solution
    • For elements that are actively mobilized within the plants and exported to young developing tissues, the deficiency symptoms tend to appear first in the older tissues. 
    • In the older leaves, biomolecules containing these elements are broken down, making these elements available for mobilising to younger leaves.
      For example -  In N, K and Mg deficiency, chlorosis appears first in old or senescent leaves.
    • When the elements are relatively immobile and are not transported out of the mature organs the deficiency symptoms tend to appear first in the young tissues. For example - S and Ca.

    So, the correct answer is option B.
  • Question 7
    1 / -0
    Necrosis refers to:
    Solution
    When a living organism's cells or tissues die or degenerate, the condition is called necrosis. In a plant, necrosis causes leaves, stems and other parts to darken and wilt. Necrosis weakens the plant and makes it more susceptible to other diseases and pests. 
    Thus, the correct answer is 'Death of tissues.'
  • Question 8
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    With reference to absorption of minerals, the term 'outer space' represents ______ while 'inner space' represents _______. 
    Solution
    • The process of absorption of minerals by roots can be divided into two main phases.
    • In the first phase, there is a rapid uptake of ions into the ‘free space’ or ‘outer space’ of cells – the apoplast (represented by intercellular spaces and cell wall) is passive. 
    • In the second phase of uptake, the ions are taken in slowly into the ‘inner space’ – the symplast (represented by cytoplasm and vacuoles) of the cells. 

    So the correct answer is option A.
  • Question 9
    1 / -0
    Mineral ion concentration in tissues that reduces, the dry weight of tissues by about 10% is considered as 
    Solution
    • Mineral ion concentration in tissues that reduces, the dry weight of tissues by about 10% is considered as toxic concentration.
    • Critical concentration is the term that is used to define the concentration of essential elements below which the growth of the plant is retarded.
    • Optimum concentration is the most desirable concentration for the function.
    So, the correct option is B.
  • Question 10
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    The process of conversion of soil nitrates into free $$N_2$$ is called (i) and is carried out by bacteria (ii).
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