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Mineral Nutrition Test - 30

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Mineral Nutrition Test - 30
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Weekly Quiz Competition
  • Question 1
    1 / -0
    A trace element essential for plant growth and radioactive isotope which is used in cancer therapy is known as
    Solution
    • Cobalt is a trace element essential for plant growth and radioactive isotope which is used in cancer therapy.
    • Cobalt in plant essential for nitrogen fixation in legumes and Cobalt-60 mostly used for radiotherapy cancer treatment.
    • There are other essential trace elements present in plants like boron, chlorine, copper, iron, manganese, sodium, zinc, molybdenum, and nickel, silicon but they are not used in cancer therapy. 
    So, option A cobalt is correct.
  • Question 2
    1 / -0
    The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below,which group of three elements shall affect most,both photosynthetic and mitochondrial electron transport -
    Solution
    Micronutrients are minerals obtained from the soil and present in plant tissues at concentrations usually less than 3micromolg^-1 dry matter. Cu (copper), Mn (manganese) and Fe (Iron) are those micronutrients which affect both photosynthesis and mitochondrial electron transport because they are the main constituents of various electron carriers.

    So, the correct answer is 'Cu,Mn,Fe'.
  • Question 3
    1 / -0
    Nitrogen is a critical element of the ecosystem because it is

  • Question 4
    1 / -0
    Phosphorus is mostly found in rocks in combination with

  • Question 5
    1 / -0
    The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:-

  • Question 6
    1 / -0
    Amount of nitrogen fixed electrochemically and
    photochemically is

  • Question 7
    1 / -0
    Nitrogen fixation is
    Solution

    Correct Option: D
    Explanation:

    • Nitrogen fixation is the process of converting the free Nitrogen into nitrogen compounds such as ammonia, nitrate, and nitrogen dioxide. 
    • There are four phases of the nitrogen cycle. they are nitrogen fixation, ammonification, nitrification, and denitrification.
    • In biological nitrogen fixation, with help of an enzyme nitrogenase, the atmospheric nitrogen is converted into ammonia.
    • Hence, nitrogen converts into ammonia and nitrate.
  • Question 8
    1 / -0
    Middle lamella is composed mainly of :

    Solution
    Answer: (D) Calcium pectate.
    Explanation:
    • Middle lamellae are also known as cementing material.
    • It is present between adjacent cell walls of plants.
    • Middle lamella is composed mainly of calcium pectate.
  • Question 9
    1 / -0
    Which one of the following elements is not an essential micronutrient for plant growth ?

    Solution
    Essential micronutrients for plant growth are: 
    1)Manganese
    2)Zinc
    3)Copper
    4)Boron
    5)Molybdenum
    6)Chlorine
    -Calcium is a macronutrient.
    So, the correct answer is 'Calcium'.
  • Question 10
    1 / -0
    The limiting factor in nitrification of soil is

    Solution
    Correct option: A
    Explanation: 

    • Nitrification is the process by which ammonia is converted to nitrites and then nitrates.
    • This process naturally occurs in the environment, where it is carried out by specialized bacteria.
    • This process depends on a number of factors, like temperature, oxygen, pH, other inhibitors. 
    • Amongst all these factors, pH has a strong effect on nitrification rates
    • Nitrifiers prefer a pH range between 7 and 9.
    Hence, pH is the correct answer.
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