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Mineral Nutrition Test - 16

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Mineral Nutrition Test - 16
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  • Question 1
    1 / -0
    Plant require Fe and Mg for
    Solution
    Magnesium (Mg) and iron (Fe) are essential macronutrients for plants. Plants require both Fe and Mg for synthesis of chlorophyll.
    Mg is absorbed by plants in the form of divalent magnesium ion ($$Mg^{2+}$$). It is required in the growing area of roots and stem, seeds, leaves, etc. It occurs as magnesium pectate in middle lamella. It is responsible for the ring structure of chlorophyll.
    Iron is required in larger amount in comparison to other micronutrients. Plants obtain iron in the form of ferric ions ($$Fe^{3+}$$). It is required everywhere in the body of plants. It is essential for the formation of chlorophyll and other pigments.
  • Question 2
    1 / -0
    Magnesium is an important component of
    Solution
    Magnesium is present in the tetrapyrrole ring of chlorophyll in its center. Magnesium is the element that causes plants to be able to convert light into energy. It is an essential component of chlorophyll. Thus, the correct option is D.
  • Question 3
    1 / -0
    Plants require two metallic compounds (minerals) for chlorophyll synthesis. They are
    Solution
    Plants require two metallic compounds (minerals) for chlorophyll synthesis. They are magnesium (Mg) and iron (Fe). They are essential macronutrients for plants. Plants require both Fe and Mg for synthesis of chlorophyll.
    Mg is absorbed by plants in the form of divalent magnesium ion ($$Mg^{2+}$$). It is required in the growing area of roots and stem, seeds, leaves, etc. It occurs as magnesium pectate in middle lamella. It is responsible for the ring structure of chlorophyll.
    Iron is required in larger amount in comparison to other micronutrients. Plants obtain iron in the form of ferric ions ($$Fe^{3+}$$). It is required everywhere in the body of plants. It is essential for the formation of chlorophyll and other pigments.
  • Question 4
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    Which of the following is a micronutrient?
    Solution
    Among Mg, Zn/Cu, Ca, and P, Zn/Cu are the micronutrients because they are required in small quantities by the plants. They do not play greater role in plants as compared to Mg, Ca and P though they are necessary. These three are macronutrients.
    Hence, B is the correct answer.
  • Question 5
    1 / -0
    Chlorosis is caused by deficiency of
    Solution
    Deficiency of any essential elements may lead to externally visible morphological changes called deficiency symptoms. Chlorosis is one of the deficiency symptoms. It is non-development or loss of chlorophyll. It leads to the yellow colour of leaves. It is caused by deficiency of iron. Iron is one of the essential micronutrients. It is essential for the formation of chlorophyll and other pigments. So, its deficiency leads to loss of chlorophyll. 
  • Question 6
    1 / -0
    Sulphur is absorbed by plants as
    Solution
    Sulphur is one of the essential macronutrients. Plants absorb sulphur from the soil in the form of sulphate ions ($$SO_4^2-$$) and also from air in form of $$SO_2$$. It is required by young leaves and meristems. It is a constituent of two amino acids methionine and cysteine. It is also used in the synthesis of some vitamins, coenzyme-A and ferrodoxin; which are involved in various metabolic activities.
  • Question 7
    1 / -0
    Which one is required in higher amounts?
    Solution
    Essential elements needed for growth and development of plants are 16 in number. These are macronutrients as well as micronutrients. For example, C, H, O, N, P, K, S, Mg, and Ca are macronutrient whereas Fe, B, Mn, Cu, Zn, Mo, and Cl are micronutrients. Na is a micronutrient. It is not required in the higher amount.
    So, the correct answer is option C.
  • Question 8
    1 / -0
    Die back of shoots is due to
    Solution
    Deficiency of -Mn is responsible for interveinal chlorosis, Mo is responsible for mottled chlorosis, B is responsible for the loss of apical dominance while Cl is responsible for bronze colour in leaves and copper (Cu) is responsible for dieback disease. It is characterized by the progressive death of twig, branches, shoot and root tip.
    The correct answer is option D.
  • Question 9
    1 / -0
    If the size of fruits diminishes in plants, which mineral ion should be added to soil.
    Solution
    Deficiency of boron leads to the small size of fruits. So if a fruit decreases or diminishes in size, boron should be added to the soil.
    Thus, the correct answer is option D.
  • Question 10
    1 / -0
    Component of nitrogenase and nitrate reductase is
    Solution
    Mo is required in the synthesis of nitrogenase and nitrate reductase and is present in the form of molybdoflavoprotein in these enzymes. These enzymes are crucial for fixing atmospheric nitrogen to the usable forms in plants.
    Hence, B is the correct answer.
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