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Mineral Nutrition Test - 39

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Mineral Nutrition Test - 39
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  • Question 1
    1 / -0
    Root nodules which are present in plants are meant for fertilizers and are found in
    Solution
    Nitrogen fixation that takes place by living things is called as biological nitrogen fixation. These include some bacteria and blue-green algae, which have acquired the capacity to fix atmospheric nitrogen during the evolutionary process by possessing a set of genes called as 'nif ' (nitrogen fixing) genes. 
    Blue-green algae like Nostoc establish symbiotic relationships in the corolloid roots of Cycas, or thalli of Anthoceros. Nitrogen fixation in legumes is the commonest type of symbiotic nitrogen fixation, which has been elaborately studied. 
    A soil bacterium called as Rhizobium infects roots of leguminous plants (belonging to family leguminosae) and forms the root nodules.
    Casuarina is a genus of 17 species in the family Casuarinaceae, native to Australia, the Indian Subcontinent, southeast Asia, and islands of the western Pacific Ocean. It has root nodules.
  • Question 2
    1 / -0
    Which of the following element is most mobile in plant metabolism?
    Solution
    Calcium is present in cell wall as calcium pectate, it is tightly bound to the middle lamella. 
    Carbon is a framework mineral and is tightly bound through covalent bonds in biomolecules and forms basic framework of plant body. 
    Similarly magnesium is present in tightly bound form in chlorophyll. 
    Phosphorous is relatively mobile. It is immobile when present in nucleic acids but other than nucleic acids phosphorous is mobile and participates in reversible phosphorylation reactions of ADP to generate ATP.
  • Question 3
    1 / -0
    Drosera is a photosynthetic plant. Why it still captures insects?
    Solution
    Drosera is an insectivorous plant. The insects are used to supplement the poor mineral nutrition. They are present in nitrogen poor soil. To compensate that nitrogen they trap insects.
  • Question 4
    1 / -0
    Which of the following elements are essential of the photolysis of water?
  • Question 5
    1 / -0
    What will happen, if Rhizobium is inoculated in wheat field?
    Solution
    Rhizobium is microaerobic rod-shaped bacteria, which increases soil fertility by fixing atmospheric nitrogen in root nodules of legumes. If Rhizobium is inoculated in the wheat field, they won't be able to infect wheat plants and form root nodules as wheat is not a leguminous plant. Consequently, soil fertility will not change. Thus, the correct answer is option A.
  • Question 6
    1 / -0
    If by radiation all nitrogenase enzyme are inactivated, then there will be no
    Solution
    Nitrogen fixation is a process in which nitrogen in the atmosphere is converted into ammonium or nitrogen oxide. Biological nitrogen fixation includes conversion to nitrogen dioxide. The biological nitrogen fixation is done with the help of nitrogenase enzymes which contain iron, molybdenum, or vanadium and are found in bacteria, blue green algae which live in symbiosis with legumes.
    Plants cannot extract nitrogen directly from the atmosphere. N$$_2$$ must be fixed by these bacteria as NH$$_3$$    . Inactivation of nitrogenase enzymes by radiation there would therefore, restrict the nitrogen fixation process by legumes.
  • Question 7
    1 / -0
    Which of the following is a nitrogen fixing organism?
    Solution
    The nitrogen fixing bacteria are microorganisms present in the soil or in plant roots that change nitrogen gas from the atmosphere into solid nitrogen compounds that plants can use in the soil.
    Two kinds of nitrogen fixers are recognized: free-living (non-symbiotic) bacteria and symbiotic bacteria. 
    Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes.
  • Question 8
    1 / -0
    Which of the followings is not caused by deficiency of minerals?
    Solution
    Etiolation means growth of plants in absence of light. Such plants are thin, pale and have elongated internodes. These plants have protochlorophyll (not chlorophyll) in their cells.
  • Question 9
    1 / -0
    Which of the following bacteria has potential for nitrogen fixation?
    Solution
    Rhizobium is a genus of gram-negative soil bacteria that fix nitrogen. Rhizobium forms an endosymbiotic nitrogen fixing association with roots of legumes. The bacteria colonize plant cells within root nodules; here the bacteria convert atmospheric nitrogen to ammonia which acts as a natural fertilizer for the plants. Rhizobium forms a symbiotic relationship with legumes. 
    Therefore, the correct answer is option D.
  • Question 10
    1 / -0
    Plant ash has maximum content of
    Solution
    Much wood ash contains calcium carbonate, as its major component, representing 25 or even 45 percent of the total ash.
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