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Mineral Nutrition Test - 53

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Mineral Nutrition Test - 53
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  • Question 1
    1 / -0
    Azolla has a symbiotic relationship with
    Solution
    Azolla has symbiotic relationship with Anabaena. Azolla is a water fern that has Anabaena in its fronds (leaf like structure). It is often inoculated to Rice fields for nitrogen fixation.
    So, the correct answer is 'Anabaena'
  • Question 2
    1 / -0
    First experiments in hydroponics were performed by.
    Solution
    Hydroponics is the science of growing plants in a medium other than soil, using mixtures of the essential plant nutrient elements dissolved in water.
    The first experiments was performed by Sachs in the year 1860. Later, Knop from 1861-5 performed experiments related to hydroponics. Both of them made synthetic solutions of essential plant nutrients in water. Included in these solutions were salts such as, potassium phosphate, calcium sulphate etc. giving the necessary elements N, P, S, Ca, Mg P and Fe. Mn were also included. 
    Thus, the correct answer is option (A). 
  • Question 3
    1 / -0
    Mineral requirement is studied through hydroponics which is related to growing plants in
    Solution
    Solution culture is being used for raising flowers and vegetables. This soil- less production of plants is called hydroponics. Plants are raised in small tanks. They are filled up with solution containing appropriate quantities of all mineral elements. The solution is changed from time to time.
    So , the correct answer is option C.
  • Question 4
    1 / -0
    Clay and organic matter of the soil have negative charges. They attract positively charged ions like.
    Solution
    Clay and organic matter are negatively charged substances. Due to the electrostatic attraction ions like $$Ca^{2+}$$, $$Mg^{2+}$$, $$K^+$$ attract to these as they are positively charged species.
    Thus, the correct answer is option D.
  • Question 5
    1 / -0
    Premature leaf fall is due to deficiency of
    Solution
    Phosphorus is absorbed by the plant in the form of phosphate ions. It is a constituent of cell membranes, ATP, nucleic acids, phospholipids and some coenzymes. It's deficiency cause the stunted growth, chlorosis, necrosis and premature leaf fall.
    So the correct answer is 'Phosphorus'.
  • Question 6
    1 / -0
    Yield of rice is enhanced by
    Solution
    The Azolla enters into symbiotic association with a nitrogen fixing bacteria known as Anabaena. It is used as a biofertilizer to enhance crop yield in a rice-wheat cropping system. It is a small aquatic fern, that can be used as a green manure for irrigated rice before the transplanting of rice and under the rice crop. 
    So, the correct answer is 'Azolla'
  • Question 7
    1 / -0
    Bacteria that convert ammonia to nitrite belong to
    Solution
    Nitrification is the phenomena of conversion of ammonium nitrogen to nitrate nitrogen. It is performed in two steps- nitrite formation and nitrate formation. In the first step, ammonium ions are oxidized to nitrites by bacteria Nitrosomonas. In the second step, nitrites are changed to nitrates e.g. Nitrobacter. Nitrates are converted back to nitrogen gas by Pseudomonas (denitrification). Mycobacterium is another group of bacteria that do not have the relationship with nitrogen fixation. It causes several diseases in humans e.g., tuberculosis by Mycobacterium tuberclosis.
    Hence, the correct answer is option B.
  • Question 8
    1 / -0
    Nitrogen fixing symbiotic bacteria present in a legume root is
    Solution
    Rhizobium is rod-shaped nitrogen-fixing bacteria live symbiotically within the roots of several leguminous plants such as alfalfa, sweet clover, sweet pea, lentils etc. These bacteria produce small outgrowths (spherical) on the surface of legume roots, called nodules.
    So the correct answer is 'Rhizobium'.
  • Question 9
    1 / -0
    Chlorosis occurs when plants are grown in
    Solution
    Chlorosis is a yellowing of plant leaves caused by deficiency of many elements, one of them being iron deficiency that affects many desirable plants. The primary symptom of iron deficiency is interveinal chlorosis, the development of a yellow leaf with a network of dark green veins.
    Thus, the correct answer is option (C).
  • Question 10
    1 / -0
    Which one is essential for root growth?
    Solution
    Calcium is an macronutrient which is absorbed by the plant as calcium ions. It is required by meristematic and differentiating tissues. It is a constituent of calcium pectate of middle lamella. Also, it is needed during the formation of mitotic spindle. Ca++ is essential for root growth and regulation of metabolic activities of plant
    So, the correct answer is 'Ca'
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