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Mineral Nutrition Test - 41

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Mineral Nutrition Test - 41
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  • Question 1
    1 / -0
    Symbiotic microorganism is 
    Solution
    Rhizobium is symbiotic nitrogen fixing organism. It forms root nodules in the roots of leguminous plants. It obtains reducing power from host plant to fix atmospheric nitrogen into ammonia.
  • Question 2
    1 / -0
    Brown heart rot of beets is due to deficiency of
    Solution
    Boron is an essential plant micronutrient. Leaves and seeds require boron. It is necessary for uptake and utilisation of $$Ca^{++}$$ ions, pollen germination, cell differentiation and translocation of carbohydrates. It plays a role in nitrogen metabolism, hormone and fat metabolism. 
    Deficiency symptoms of boron are as follows-
    i. It causes brown heart-rot disease in beetroots.
    ii. In apple internal tissues become corky.
    iii. Causes leaf to curl and become brittle.
    iv. Premature fall of fruits and flowers.
  • Question 3
    1 / -0
    Chlorosis is caused due to deficiency of 
    Solution
    Magnesium is an essential plant macronutrient. It is a component of chlorophyll pigment. Deficiency of magnesium will lead to inhibition of chlorophyll biosynthesis. Thus, leaves will show general yellowing, also known as chlorosis.
  • Question 4
    1 / -0
    Which of the following is a trace element?
    Solution
    A chemical element that is absorbed in small amounts by plants is called a trace element which is essential for the proper growth, development, and physiology of the plants. Chromium, cobalt, copper, iron, manganese, magnesium, molybdenum, selenium, zinc all are the example of trace elements. 
    Hence, option C is correct.
  • Question 5
    1 / -0
    Which one of the following elements is not an essential micronutrient for plant growth?
    Solution
    Plants require seventeen essential mineral elements which can be grouped into two classes based on the amount required- 
    Macronutrients (required in large amount) and micronutrient (required in small amounts). 
    The essential macronutrients are carbon, hydrogen, oxygen, nitrogen, phosphorous, potassium, sulphur, magnesium, calcium and essential micronutrients are iron, molybdenum, boron, chlorine, copper, zinc, nickel and manganese. 
  • Question 6
    1 / -0
    The element which can not be placed along with micronutrients is
    Solution
    Plants require 17 essential mineral elements, which are grouped into two categories- macronutrients and micronutrients, depending on the quantity required by the plants. 
    The macronutrients required are carbon, hydrogen, oxygen, nitrogen, potassium, calcium, magnesium, phosphorous, sulphur. 
    The micronutrients are copper, zinc, molybdenum, chlorine, boron, nickel, iron, manganese. 
  • Question 7
    1 / -0
    Protoplasmic elements are
    Solution
    Plants require a number of mineral elements for optimum growth. These mineral elements perform different functions in plants. All the major biomolecules of cell protoplasm - carbohydrates, proteins, fats, nucleic acids can be synthesized by basically few mineral elements, like carbon, hydrogen, oxygen, nitrogen, phosphorous and sulphur. Hence, these are called as framework or protoplasmic elements.
  • Question 8
    1 / -0
    When chlorophyll is burnt, which one is obtained?
    Solution
    Magnesium is an essential macronutrient for plants. It is required for activity of many enzymes, specially kinase enzymes. It is also an important component of chlorophyll.
    Chlorophylls have a porphyrin head and a phytol tail. The porphyrin head is cyclic tetrapyrrole structure with magnesium present in the centre of head. Deficiency of magnesium produces chlorosis in plants, due to lack of chlorophyll formation. If chlorophyll is burnt the inorganic part, i.e., magnesium will be left over.
  • Question 9
    1 / -0
    Which element is not considered as macronutrient?
    Solution
    The plant ash reveals the presence of 40 elements but all are not essential for plant nutrition, only a few are essential for growth and development of plants. These are called as essential elements. 
    The essential elements may be grouped as major elements or macronutrients and trace elements or micronutrients, based on their requirement by plants. 
    Major elements or macronutrients elements are required in large amounts and form the plant consituents. These include carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium and sulphur. 
    Elements like iron, boron, managanese, copper, zinc and molybdenum are required for plants only in very small amounts but these are indispensable for the normal growth and development of plants.
  • Question 10
    1 / -0
    Sulphur is an important nutrient for optimum growth and productivity in
    Solution
    Sulphur is an important nutrient for optimum growth and productivity in Pulse crops. Sulphur is constituent of certain amino acids. The amino acids form the protein by polymerisation. The pulses are rich in protein. Hence option C is correct.
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