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Mineral Nutrition Test - 31

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Mineral Nutrition Test - 31
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  • Question 1
    1 / -0
    In nitrogen cycle, which of the following plays an important role ____________.
    Solution
    • To be used by plants, the $$N_2$$ must be transformed through a process called nitrogen fixation. Fixation converts nitrogen in the atmosphere into forms that plants can absorb through their root systems.
    • Nitrobacter plays an important role in the nitrogen cycle. They oxidize nitrite to nitrate in the soil.
    • Rhizopus and Mucor are saprophytic fungi.
    • All grren algae are capable of photosynthesis, but not of nitrogen fixation.
    is absorbed by plants when herbivores feed on these plants, the $$N_2N2
    So, the correct answer is 'Nitrobacter'
  • Question 2
    1 / -0
    Human-caused changes to the nitrogen cycle are expected to result in
  • Question 3
    1 / -0
    The critical elements are
    Solution
    Macronutrients, which become commonly deficient in the soils are called as critical elements. They are three in number - nitrogen, phosphorous and potassium. Most fertilizers contain critical elements. They are called as complete fertilizers. Deficiency caused by a critical element is known as primary deficiency.
  • Question 4
    1 / -0
    EDTA is commonly used in tissue culture. It is a
    Solution
    EDTA stands for Ethylenediaminetetraacetic acid. It is widely used for both industrial and medical purposes. It is a buffer. Tris EDTA buffer is used in tissue culture as divalent cations chelator. It binds to calcium and thus prevents adherence of cells to each other. It also prevents aggregation of cells in cell suspension by binding to calcium and magnesium ions present in tissue culture media. 
    Thus, the correct answer is option D.
  • Question 5
    1 / -0
    Intact chloroplasts of green cells can be isolated with the help of
    Solution
    Chloroplast can be isolated in tris-HCl buffer made 0.5M with respect to the sucrose. Here, the extracts of the chloroplast extracted with the sucrose solution had considerable enzymatic activity and did not inhibit this activity.
    Thus, the correct answer is option (D), '0.5 M solution of sucrose'.
  • Question 6
    1 / -0
    Woodward (1669) observed that plants grow better in muddy water than in rain water, why?
    Solution
    Plants require seventeen essential elements for optimum growth. Those elements, which are required in large quantity are called macronutrients, whereas those elements, which are required in lesser quantity, are called micronutrients. Out of the seventeen, essential mineral elements carbon and oxygen are obtained from air, hydrogen from water. Rest all the minerals are absorbed from the soil. Hence, muddy water (having soil) is better suited to support plant growth than pure rain water.
  • Question 7
    1 / -0
    Which of the following element is not required by plants for their normal healthy growth?
    Solution
    • Calcium, in the form of calcium pectate, is responsible for holding together the cell walls of plants.
    • Magnesium is the powerhouse behind photosynthesis in plants. Without magnesium, chlorophyll cannot capture sun energy needed for photosynthesis. In short, magnesium is required to give leaves their green color. Magnesium in plants is located in the enzymes, in the heart of the chlorophyll molecule.
    • Nitrogen is so vital because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide (i.e., photosynthesis). It is also a major component of amino acids, the building blocks of proteins. Without proteins, plants will wither and die.
    • Pb is toxic even in small concentrations.

    So, the correct answer is 'Lead'.
  • Question 8
    1 / -0
    Woodward (1669) observed that plants grow better in muddy water than in rain water. This is because
    Solution
    Woodward observed that soil provides ingredients for the nourishment of plants. It has been shown that plants require seventeen essential elements for optimum growth. Those elements, which are required in large quantity are called as macronutrients, whereas those elements, which are required in lesser quantity are called as micronutrients. 
    Out of the seventeen essential mineral elements, carbon and oxygen are obtained from air, hydrogen from water. Rest all the minerals are absorbed from the soil. Hence, muddy water (having soil) is better suited to support plant growth than pure rain water, because rain water is supposed to be similar to regular tap water. 
    So, the correct answer is 'Muddy water had most of essential elements dissolved in it'
  • Question 9
    1 / -0
    Which are protoplasmic elements?
    Solution
    Primary elements are the protoplasmic elements (carbon, hydrogen, oxygen, nitrogen, phosphorous and sulphur), which become constituent of protoplasmic components like nucleic acids, proteins, chlorophyll etc. Carbon, hydrogen and oxygen are the basic framework elements required for synthesis of all the biomolecules. Nitrogen and phosphorous are the element required for synthesis of nucleic acids and nitrogen and sulphur are the additional element, required for the synthesis of proteins.
  • Question 10
    1 / -0
    Which of the following are called primary elements?
    Solution
    17 essential elements required by plants for normal growth, development and reproduction. These are either macronutrients, required in large amount or micronutrients, required in small amount. Macronutrients are of three types, primary, secondary and tertiary elements. Primary elements derived from air and water include carbon, hydrogen and oxygen. Other primary elements include phosphorous, potassium and nitrogen. Secondary and tertiary elements include sulfur, magnesium and calcium.
    Thus, the correct answer is option B.
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