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Mineral Nutrition Test - 9

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Mineral Nutrition Test - 9
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  • Question 1
    1 / -0

    Enzyme nitrogenases, which play a prominent role in nitrogen-fixation, may contain all the elements, except:

    Solution

    Potassium is not present in any nitrogenase but the soil potassium affects nitrogenase activity.

  • Question 2
    1 / -0

    If a plant develops the deficiency of boron, then it will ________.

    Solution

    If a plant has boron deficiency, it would not flower, as boron deficiency affects the vegetative and reproductive growth of plants.

  • Question 3
    1 / -0
    Transfer of electrons to photosystem II is facilitated by
    Solution

    Chlorine is required in the transfer of electron to photosystem II.

  • Question 4
    1 / -0

    Deficiency of which of these minerals leads to both necrosis and chlorosis?

    Solution

    Deficiency of K and Mg causes both chlorosis and necrosis.

  • Question 5
    1 / -0

    Deficiency of Fe and Mg can have symptom similarity with the toxicity of

    Solution

    Mn competes with Fe and Mg for uptake. Therefore, Mn toxicity symptoms are actually the same as deficiency symptoms of Fe and Mg.

  • Question 6
    1 / -0

    During formation of root nodules, which step takes place before the division of cortex and pericycle?

    Solution

    Bacteria modify themselves into rod shaped bacteroids before the division of cortex and pericycle resulting in formation of root nodules.

  • Question 7
    1 / -0

    Symbiotic N2-fixing actinomycetes are present in the roots of all of the following plants, except ______________.

    Solution

    The roots of Cycas contain symbiotic nitrogen-fixing Nostoc.

  • Question 8
    1 / -0

    Rhizobium meliloti, a nitrogen fixer, forms nodules in the root of

    Solution

    Rhizobium meliloti forms root nodules in alfalfa.Rhizobium leguminosarum forms root nodules in pea.Rhizobium japonicum forms root nodules in soyabean.Rhizobium phaseoli forms root nodules in mung.

  • Question 9
    1 / -0
    Plant ash is made up of
    Solution

    Plant ash is made up of mineral salts or elements which the plant absorbs. Less than 10 percent is potash, and less than 1 percent is phosphate; there are trace elements of iron, manganese, zinc, copper and some heavy metals.

  • Question 10
    1 / -0
    Conversion of ammonia to nitrite and nitrite to nitrate in a stretch is carried out by
    Solution

    Bacteria in the genus Nitrospira are able to carry out both steps, i.e. conversion of ammonia to nitrite and nitrite to nitrate. The genome of this chemolithoautotrophic organism encodes the pathways both for ammonia and nitrite oxidation.

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