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Mineral Nutrition Test - 51

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Mineral Nutrition Test - 51
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  • Question 1
    1 / -0
    Little leaf$$/$$ leaf rosetting is deficieny symptom of
    Solution
    Nutrients are essential for the growth and development of organisms. In the absences of it causes disease called as deficiency disease. Its symptoms are as follows:
    Zinc (Zn) - Leaf malformation, liitle leaf, leaf rossets, interveinal chlorosis, leaf distortions, white bud, stunted growth.
    Manganese (Mn) - Interveinal chlorosis, grey spots, legume cotyledons with brownish spots, sterile flowers.
    Iron (Fe)  - Interveinal chlorosis appears first in young leaves, veins green, growth reduced.
    Boron (B) - Loss of apical dominance, abscission of flowers, smallsize of fruits, stunted growth, absence of root nodules in leguminous plants, browning if cauliflower.
    So, the correct answer is option A.
  • Question 2
    1 / -0
    Which of the following is not an essential micronutrient?
    Solution
    Correct answer-No any given option is correct.
    Micronutrients are those essential elements which are required by plants in small amounts, less than 10 m mole/kg of dry matter. They are mostly involved in the functioning of enzymes. Since, micronutrients are required in traces; they are also called trace elements. Micronutrients are eight in number - iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel. All these eight micronutrients are essential.
  • Question 3
    1 / -0
    Which of the following is present in the core of chlorophyll molecule?
    Solution
    Mg is present in the central core of chlorophyll molecule in its tetrapyrrole ring structure. Without it chlorophyll cannot traps the solar energy for photosynthesis.
    Hence, B is the correct answer.
  • Question 4
    1 / -0
    Which of the following is a macronutrient?
    Solution
    The essential elements which are required by the plants in comparatively large amounts are called as major elements or macronutrients. They are C, H, O, N, P, K, Ca, S, Mg. Micronutrients which are required in relatively fewer amounts are Fe, Mn, Zn, B, Cu, Ni, CI, and Mo. These are the cofactors of enzymes and helps in the enzymatic activity of the plant.
    Thus, the correct answer is option B.
  • Question 5
    1 / -0
    Which is not an essential element for plants?
    Solution

    16 elements are found to be essential. They are C, H O N P K S Mg Ca Fe B Mn Cu Zn Mo Cl. Recently four more elements have been added to the list. They are silicon, cobalt, vanadium and nickel. So the total number of essential elements is considered to be 20 instead of 16. Na/Ba/Cd/Al/Pb are not essential at all. Thus the correct answer is option D).

  • Question 6
    1 / -0
    Element required in least quantity is
    Solution
    Macroelements are nutrients that are required in larger amounts by plants and other living organisms. Carbon(C), hydrogen (H), nitrogen (N), oxygen (O), phosphorous (P), potassium (K), calcium (Ca), sulfur (S), and magnesium (Mg) are macroelements.
    Microelements are nutrients that are required in smaller amounts. Boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni). and cobalt (Co) are microelements.
    Thus, the correct answer is option (D).
  • Question 7
    1 / -0
    Which is not a micronutrient?
    Solution
    Macronutrients are nutrients that are required in larger amounts by plants and other living organisms. Carbon(C), hydrogen (H), nitrogen (N), oxygen (O), phosphorous (P), potassium (K), calcium (Ca), sulfur (S), and magnesium (Mg) are macronutrients.
    Micronutrients are nutrients that are required in smaller amounts. Boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni). and cobalt (Co) are categorized as micronutrients.
    Thus, the correct answer is option (A). 
  • Question 8
    1 / -0
    Pungent principle, sinigrin, of crucifers is a
    Solution
    Sinigrin is a glucosinolate. According to structure, it is a glycoside having sulphur, found in Brussels, sprouts and broccoli etc. Whenever sinigrin containing plant tissue is crushed, the enzyme myrosinase degrades sinigrin to mustard oil, which is responsible for pungent taste. It is used as reference material in procedures for the isolation and identification of glucosinolates. 
    So the correct answer is 'Glycoside having sulphur'.
  • Question 9
    1 / -0
    Major role of phosphorus in plant metabolism is
    Solution
    Phosphorus is a macronutrient absorbed by the plant in the form of phosphate ions. It is a constituent of ATP, cell membrane, nucleic acids, phospholipids and some coenzyme. Thus it plays a major role in plant metabolism by generating metabolic energy.
    So the correct answer is 'Generate metabolic energy'.
  • Question 10
    1 / -0
    Element playing important role in nitrogen fixation is
    Solution
    Correct Answer: (B) Mo
    Explanation:
    • Manganese helps in pollen tube growth, pollen germination, and root cell elongation.
    • While molybdenum helps in nitrogen fixation in the plants as it is an active component of the enzyme nitrogenase.
    • Zinc is an essential micronutrient that helps the plant in synthesizing the growth hormone.
    • Copper helps the plants in the normal functioning of cell membranes.
    Hence, molybdenum is an important micronutrient that helps plants in nitrogen fixation.

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