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Mineral Nutrition Test - 67

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Mineral Nutrition Test - 67
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  • Question 1
    1 / -0
    In the initial phase of mineral ion absorption, there is a rapid uptake of ions into ______ space of cells. Ions absorbed in this phase are ______ exchangable. It is _____ uptake as it ______ the expenditure of metabolic energy.
    Solution
    In the principal stage, an underlying fast take-up of particles into the 'free space' or 'space' of cells the apoplast, is detached.
    So, the correct option is 'outer, freely, passive, does not require'.
  • Question 2
    1 / -0
    Following observations are made for a plant grown under different cinditions.
    I. Chloride and magnesium in soil + light $$\rightarrow$$ green plant
    II. I. Chloride and magnesium in soil + dark $$\rightarrow$$ etiolated plant
    III. Magnesium + light $$\rightarrow$$ green plant
    IV. Intermittent light flashes + chloride $$\rightarrow$$ etiolated plant

    From the above observations, it is concluded that the factors necessary for the green colour in plants are 
    Solution
    Without sufficient amounts of magnesium, plants begin to degrade the chlorophyll in the old leaves. This causes the main symptom of magnesium deficiency or yellowing between leaf veins, giving the leaves a marbled appearance.
    So, the correct option is 'magnesium and light.'.

  • Question 3
    1 / -0
    Which one of the following statements can best explain the term critical concentration of an essential element? 
    Solution
    Critical Concentration is the term which is used to define the concentration of essential elements below which the growth of plant is Retarded or Reduced. Also, if the concentration of essential elements rise above the critical concentrations.  it leads to Toxicity. So, the correct answer is "Essential elements concentration below which plant growth is retarded."
  • Question 4
    1 / -0
    For its action, nitrogenase requires
  • Question 5
    1 / -0
    Select the option which completes the given equation for reductive amination.

    Solution
    In this reaction, ammonia combines with a keto acid. The most important keto acid is the alpha ketoglutaric acid produced during the operation of Krebs cycle. The keto acid then undergoes enzymatic reductive amination to produce an amino acid. The enzyme is glutamate dehydrogenase.
    Thus, the correct answer is 'i-alpha-ketoglutaric acit, ii- glutamate dehdrogenase.'
  • Question 6
    1 / -0
    Refer the given reaction. It represents 

    Solution
    Reductive amination is also known as reductive alkylation. It is a form of amination reaction that involves the conversion of a carbonyl group to an amine via an intermediate imine. The carbonyl group is most commonly a ketone or an aldehyde. 
    Thus, the correct answer is 'reductive amination.'
  • Question 7
    1 / -0
    Read the following statements and select the incorrect ones.

    (i) The co-ordinated activities of the legume and Rhizobium bacteria depend on chemical interactions between the symbiotic partners. 
    (ii) Leguminous roots secrete chemical attractants that attract Rhizobium bacteria living nearby.
    (iii) N, P and K usually do not get deficient in soil due to their low plant requirement.
    (iv) Nitrogen cycle is regular circulation of nitrogen amongst living organisms with its reservoir pool in lithosphere and cycling pool in atmosphere. 
  • Question 8
    1 / -0
    Nodules in soybean plant experts the fixed nitrogen in the form of 
    Solution
    A. Ureides (degraded urea) are employed as a means of nitrogen transport from the nodules of some legumes( e.g., Soya-bean) and re- transport from the ageing organs. They have a high nitrogen to carbon ratio.
    B. Amides, double aminated keto acids. The two most common amides are glutamine and asparagine.
    C. The nitrogen fixers protect themselves from it by providing organic acids. The reaction between ammonia and organic acids give rise to amino acids.
    So, the correct answer is 'Ureids'.
  • Question 9
    1 / -0
    Refer the given reaction. What does it depict?

    Solution
    Transamination is  very important reaction for amino acid biosynthesis. The reaction involves transfer of amino group from already synthesized amino acid to the keto acid. The reaction is catalyzed by enzymes called transaminases. A large number of amino acids are synthesized by this transamination reaction. Amino acids are organic molecules containing nitorgen. The incorporation of amino group from ammonium into keto acids represents the major step for synthesis of nitrogenous organic biomolecules.
    Thus, the correct answer is 'Transamination.'
  • Question 10
    1 / -0
    One mineral activates the enzyme catalase and the other is a constituent of the ring structure of chlorophyll. These mineral are ___ and ____ respectively.
    Solution
    •  Mg is an important constituent of chlorophyll molecule where it occupies a central position of the porphyrin ring and essential for photosynthesis.
    •  Fe is the core ion of the heme group present in the globular structure of enzyme catalase that removes free oxygen radicals from the system.
    So, the correct answer is 'Iron and Magnesium'

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