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Mineral Nutrition Test - 32

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Mineral Nutrition Test - 32
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  • Question 1
    1 / -0
    In plants a common symptom caused by deficiencies of P and Mg is
    Solution
    Necrosis means death of tissues, caused by deficiency of phosphorous (after chlorosis), potassium (after chlorosis), magnesium, calcium, manganese and chlorine.
  • Question 2
    1 / -0
    Which of the following are common symptoms developed due to deficiency of Ca, Mg, K and Mo?
    Solution
    Chlorosis is appearance of yellow colour due to non synthesis or destruction of chlorophyll pigment. Chlorosis can be marginal or interveinal. It is usually caused due to deficiency of magnesium, nitrogen, potassium, calcium, sulphur, and iron.
  • Question 3
    1 / -0
    An element with the help of $$Na^+$$ and $$K^+$$ determines the solute concentration and anion-cation balance in cells is
    Solution
    Sodium, potassium and chlorine are the charged ions present in the cell sap. They play an important role in determining the solute concentration of cell sap. Sodium ions  are the principal cations found outside cells in living organisms. 
    They help regulate and control the osmotic levels outside the body of living organisms. Potassium ions are the principal cations found inside cells in living organisms. Chloride ions are the principal anions found outside cells in the body. They serve as counterions (ions necessary to balance electrical charge) for the extracellular fluid and for cell sap. Like sodium and potassium ions, chloride ions are involved in maintaining acid-base and fluid balances. 
    so, the correct answer is 'Chlorine'
  • Question 4
    1 / -0
    In the case of diseased plants, small spots or streaks of dead tissue appear. The symptom is called as
    Solution
    Diseased plants or plants growing with some deficiency of certain minerals show characteristics symptoms like chlorosis, necrosis, mottling etc. Necrosis means death of tissue. Chlorosis means yellowing due to loss of chlorophyll. Mottling means appearance of uneven spots. Distortion means general deformation.
  • Question 5
    1 / -0
    What features of an element is not required to prove it to be essential?
    Solution
    Plants absorb a number of minerals. All of which is not essential for the normal growth and reproduction of plants. Hence, it is important to devise criteria of essentiality. The essential minerals are those, which are absolutely required for normal growth and reproduction and in the absence of which the plant cannot set seed. The essential mineral cannot be substituted by any other mineral. The mineral is essential if it is directly involved in the metabolism of the plant. The essential mineral may not be present in all the plant tissue. All minerals are not present in all the tissues and mineral distribution within the plant body depends on the physiological requirements of plant tissue.
    so, the correct answer is 'It is found in all tissues of plants.'
  • Question 6
    1 / -0
    Which one of the following micronutrients is required by plants in least quantity?
    Solution
    The essential mineral nutrients required by plants in lesser quantity are called as micronutrients. 
    Molybdenum is the micronutrient required in least quantity. Molybdenum acts as an activator of certain enzymes, involved in nitrogen metabolism, including nitrate reduction and nitrogen fixation, ascorbic acid synthesis and some redox reactions.
    So, the correct answer is 'Mo'
  • Question 7
    1 / -0
    Which element is common to nucleic acids, phospholipids, ATP, ADP, NADPH?
    Solution
    Phosphorous is an essential macronutrient for plants. It is a constituent of nucleotides, nucleic acids, certain proteins, phospholipids, nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP). NAD and NADP are essential coenzymes for many enzymes.
  • Question 8
    1 / -0
    The micronutrients
  • Question 9
    1 / -0
    Leaf tip bending may be caused due to deficiency of
    Solution
    The calcium-deficient leaves show necrosis (tissue death) around the base of the leaves. The very low mobility of calcium is a major factor determining the expression of calcium deficiency symptoms in plants. Classic symptoms of calcium deficiency include blossom-end rot of tomato (burning of the end part of tomato fruits), tip burn of lettuce, blackheart of celery and death of the growing regions (eg., leaf tip) in many plants. All these symptoms show soft dead necrotic tissue at rapidly growing areas, which is generally related to poor translocation of calcium to the tissue rather than a low external supply of calcium. 
    Therefore, the correct answer is option B.
  • Question 10
    1 / -0
    The 'brown heart disease' is caused due to deficiency of
    Solution
    Boron is an important micronutrient for plant. It is required for calcium metabolism, pollen germination, cell differentiation, carbohydrate transport, root nodulation, synthesis of pectin, proteins and nucleic acids, membrane functions, cell elongation and cell differentiation.
    Deficiency of boron leads to browning of cauliflower, heart rot or brown heart of sugar beet and turnip, internal cork of apple, top sickness, stunted growth, leaf rosette, decreased nodulation in legumes, small size of fruits and disintegration of softer parts.
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