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Mineral Nutrition Test - 17

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Mineral Nutrition Test - 17
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  • Question 1
    1 / -0
    Plants absorb nitrogen as
    Solution
    Nitrogen is one of the essential macroelements present in plants. It is one of the non-mineral elements. Plants absorb nitrogen from soil as nitrate (NO−3NO3−). Nitrogen is required in largest amount in plants. It is mainly required in the meristematic tissues and metabolically active cells. It is present in large number of biomolecules, so it is essential for plants.
    So, the correct answer is 'All the above'
  • Question 2
    1 / -0
    Copper is activator of enzyme
    Solution
    Copper is a micronutrient absorbed as cupric ions by the plants. It is essential for the overall metabolism in plants. It is component or activator of plastocyanin, tyrosinase, cytochrome oxidase and RuBP carboxylase.
    So the correct answer is 'Tyrosinase'.
  • Question 3
    1 / -0
    Non-symbiotic nitrogen fixing prokaryote is
    Solution
    Rhizobium is nitrogen fixing bacteria symbiont in proteinacious roots like alfa alfa, sweet clover, sweet pea.
    Nostoc  is common symbiont in lichens, azolla and cycad roots.
    Frankia is symbiont in Alnus and casuarina (non leguminous) plants.
    Azotobactera is non symbiotic or free living bacterium. It helps in the nitrogen fixation.
    Thus, the correct option is D.
  • Question 4
    1 / -0
    The element required for phloem transport is
    Solution
    Boron is required for phloem transport.  It forms a complex with polyols which helps in phloem transport. 
    So the correct answer is C.
  • Question 5
    1 / -0
    Which one does not fix nitrogen?
    Solution
    Azotobacter, Anabaena, Nostoc are the nitrogen fixing prokaryotes in lichens, azolla, Cycas while Spirogyra is a green algae which does photosynthesis. It does not fix nitrogen.
    Hence, the correct option is B.
  • Question 6
    1 / -0
    Minerals involved in carbohydrate translocation, maintaining ribosome structure and activation of nitrogenase are respectively.
    Solution
    Boron is necessary for the translocation of sugar (carbohydrates) in plants. 
    Magnesium ions (and other cations) play an important role in maintaining the structure of the ribosome.
    Nitrogenase is the Molybdenum dependent enzyme.
    Thus, the correct answer is option (E).

  • Question 7
    1 / -0
    Element involved in nitrogen fixation is
    Solution
    The element which is required in nitrogen fixation is Iron as it a component of Nitrogenase enzyme as Mo-Fe protein. This enzyme reduces nitrogen to ammonia.
    Thus the correct answer is C.
  • Question 8
    1 / -0
    Which is a component of chlorophyll?
    Solution
    Chlorophyll is the green colored pigment which is present in the plastid. It is located in the thylakoid membranes of the plastids. It has a molecular formula of C$$_{55}$$H$$_{72}$$O$$_5$$N$$_4$$Mg. Magnesium is centrally located in the chlorophyll. It consists of porphyrin ring which has magnesium ion in the center. The two types of chlorophyll are chlorophyll a and b. Chlorophyll a has a porphyrin ring with the side chain of the methyl group and a phytol chain. Chlorophyll b has a porphyrin ring with the side chain of aldehyde group and a phytol chain. It acts like an accessory pigment.
    So, the correct answer is option A.

  • Question 9
    1 / -0
    Match the columns and choose the correct option.
    III
    (a)Magnesium$$1$$.Alcohol dehydrogenase
    (b)Molybdenum$$2$$.Phosphoenol pyruvate
    (c)Zinc$$3$$.Nitrogenase
    Solution
    Magnesium is present in phosphoenol pyruvate enzyme.
    Molybdenum is a key element of nitrogenase as Mo-Fe protein.
    Zinc is an activator of alcohol dehydrogenase enzyme.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    An element playing important role in nitrogen fixation is?
    Solution

    Correct option: D

    Explanation:

    • In nitrogen fixation, atmospheric nitrogen is fixed into nitrates.
    • Nitrogen fixation can be done in many ways but in biological nitrogen fixation some microbes are involved in it such as Rhizobium when shows symbiotic association with roots of the plant where it stimulates nodule formation, there’s a leghemoglobin pigment (pink color) which removes oxygen and creates an anaerobic condition for the enzyme nitrogenase, it helps in nitrogen fixation.
    • The structure of the nitrogenase enzyme has elements: metal, iron, molybdenum (Mo) which are the important element for the formation of the nitrogenase enzyme.

    Hence, ‘molybdenum’ is the correct answer.

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