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Mineral Nutrition Test - 68

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Mineral Nutrition Test - 68
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  • Question 1
    1 / -0
    Plants can be grown in - 
    Solution
    Plants require fundamental supplements for development, physiological changes, and other critical exercises. Soil having basic supplements is reasonable for plant development. Plants can likewise be developed in water having every single fundamental supplement.

    So, the correct option is 'water or soil without essential nutrients'.
  • Question 2
    1 / -0
    Reaction carried out by $$N_2$$ fixing microbes include
    $$2NH_3 + 3O_2 \rightarrow 2NO_2^- + 2H^+ + 2H_2O$$            (i)
    $$2NO_2^- + O_2 \rightarrow 2NO_3^-$$                                       (ii)
    Which of the following statements about these equations is not true?
    Solution
    Phototrophic bacteria are a group of bacteria, whose energy for growth is derived from sunlight and their source of carbon comes from carbon dioxide or organic carbon.
    So, the correct option is 'Bacteria carrying out these steps are usually photoautotrophs'.
  • Question 3
    1 / -0
    Which one of the following symptoms is not due to manganese toxicity in plants?
    Solution
    Manganese toxicity also frequently causes chlorosis (pale or yellow colour), most severe on the younger leaves, due to an induced iron deficiency. Either one or both of these symptoms may be observed in crops affected by manganese toxicity. So, the correct answer is "Deficiency in both iron and nitrogen is induced."
  • Question 4
    1 / -0
    With regard to the Biological Nitrogen Fixation by Rhizobium in association with soybean, which one of the following statement/ statements does not hold true?
    Solution
    Nitrogenase is a unique enzyme that is critical to the bacteria that utilizes this enzyme. Its function is necessary for anaerobic bacteria since it is their main source of nitrogen. Nitrogenase  is a sensitive enzyme that can easily be inhibited by oxygen and other compounds and affects its ability to fix nitrogen.

    So, the correct answer is "Nitrogen may require oxygen for its functioning."
  • Question 5
    1 / -0
    Plants require Sulphur for
    Solution
    Sulphur is an essential mineral required by plants. It is mainly involved in the formation of proteins and enzymes.
    So, the correct answer is 'protein synthesis'.

  • Question 6
    1 / -0
    Unicellular symbiotic organisms improve yield of legumes by
    Solution

    Symbiotic nitrogen fixing bacteria form a mutually beneficial association with the plants. The bacteria obtain food and shelter from plants. In return, they give a part of their fixed nitrogen to the plants. The most important of the symbiotic nitrogen fixing bacteria is Rhizobium. It forms nodule on the roots of legume plants. They develop the ability to fix nitrogen only when they are present inside the root nodules. In the nodule cells, bacteria (bacteroids) lie in groups surrounded by membrane of the host which is lined by a pink-red pigment called leghaemoglobin. So, the correct answer is 'Fixing atmospheric nitrogen and colonising roots of host plant'.

  • Question 7
    1 / -0
    Which one of the following plants can fix nitrogen from air?
    Solution
    Nitrogen for plants is vital to the success of a garden. Without sufficient nitrogen, plants will fail and will be unable to grow. Nitrogen is abundant in the world, but most of the nitrogen in the world is a gas and most plant cannot use nitrogen as a gas. Most plants must rely on the addition of nitrogen to the soil in order to be able to use it. There are a few plants that love nitrogen gas, though; they are able to draw the nitrogen gas from the air and store it in their roots. These are called nitrogen fixing plants. Nitrogen fixing plants don’t pull nitrogen from the air on their own. They actually need help from a common bacteria called Rhizobium. The bacteria infects legume plants such as peas and beans and uses the plant to help it draw nitrogen from the air. The bacteria converts this nitrogen gas and then stores it in the roots of the plant. When the plant stores the nitrogen in the roots, it produces a lump on the root called a nitrogen nodule. It is harmless to the plant but beneficial during gardening.
    So the correct option is 'pea'.

  • Question 8
    1 / -0
    Nitrogen fixing microbe associated with Azolla in rice fields is 
    Solution
    Anabaena is heterocyst-forming, photoautotrophic cyanobacteria that perform oxygenic photosynthesis. Anabaena grows in long filaments of vegetative cells. It is also used for nitrogen fixation.
    So, the correct option is 'Anabaena'.
  • Question 9
    1 / -0
    Match column I with column II and select the correct answer from the given codes. 
    Column I Column II 
    A.Ganga action plan(i)$$N_2$$ fixing cyanobacterium
    B.Bt cotton(ii)Ministry of environment and forests
    C. Rhizobium(iii) Insect resistant plant
    D.Nostoc(iv)$$N_2$$ fixing bacterium
    Solution
     
     Column I  Column II 
     A. Ganga action plan (ii) Ministry of environment and forests ( This is initiated to save the river Ganga from pollution) .
     B. Bt cotton (iii) Insect resistant plant ( Bt toxin exist as inactive protoxins which get ingested by by insect and converted them into active form due to alkaline pH present in their gut . This solublises the crystals of Bt and create pores on the surface wall of insect gut and cause lysis) .
     C. Rhizobium(iv) N2  fixing bacterium ( They fix atmospheric nitrogen into ammonia for the plant uptake) .


     D. Nostoc(i)  N2 fixing cyanobacteria
    So, the correct option is 'A-(ii) B-(iii) C-(iv) D-(i)'
  • Question 10
    1 / -0
    Which of the following plant micronutrients is an activator for a number of enzymes particularly involved in the dehydrogenation and decarboxylation reactions during respiration?
    Solution
    Krebs cycle is a stepwise cyclic oxidation process in which four.  Mn2+ ion is required for the functioning of enzyme. One molecule is produced during link reaction when Oxidative Decarboxylation of pyruvate to acetyl CoA takes place. ... Citric Acid cycle is the second step of cellular respiration. So, the correct option is "B" (Manganese).
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