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Mineral Nutrition Test - 21

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Mineral Nutrition Test - 21
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  • Question 1
    1 / -0
    Which one of the following is a free living nitrogen-fixing bacterium?
    Solution
    Azotobacter is a free-living nitrogen-fixing bacteria. Rhizobium lives in symbiotic association with roots of leguminous plants.
    Hence, the correct answer is 'Azotobacter'
  • Question 2
    1 / -0
    Which of the following ions of heavy metals participate in process of photosynthesis in higher plants?
    Solution
    • Magnesium is an important constituent of chlorophyll, manganese is required for photolysis of water, and copper along with iron are important for proteins like plastocyanin and iron-sulphur proteins that are important participants of light reaction of photosynthesis.

    So, the correct answer is option D.
  • Question 3
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    An essential element is 
    Solution
    Plants absorb a number of mineral elements. All of which may not be essential for growth of plants. Hence, criteria of essentiality should be established. One of the criteria of essentiality is that the mineral element is indispensable and irreplaceable by another element for growth of plant.
    Example, C, H, N, P etc a total of 17 elements.
    So, the correct answer is 'Is indispensable for growth and is irreplaceable'
  • Question 4
    1 / -0
    Which of these organisms does not help in $$N_{2}$$ fixation?
    Solution
    Spirogyra is a filamentous green alga. They are found in freshwater such as pools, ponds, etc. They have long thin unbranched filaments of cylindrical cells. They are not involved in nitrogen fixation. Whereas Anabaena, Nostoc and Rhizobium play a critical role in nitrogen fixation.
    Therefore, the correct answer is option C. 
  • Question 5
    1 / -0
    Sulphur is an important nutrient for optimum growth and productivity in
    Solution
    Oilseed crops like mustard are rich in sulphur compounds. Hence, sulphur is an important mineral element required for the growth of oilseed crops.
  • Question 6
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    Which one of the following elements is necessary for the translocation of sugars in plants?
    Solution
    Plants require seven micronutrients which are boron, zinc, copper, manganese, molybdenum, iron and chlorine. Boron is an essential micronutrient for plants. It is required for transportation of sugars.
  • Question 7
    1 / -0
    Which one of the following is not an essential mineral element for plant while the remaining three are?
    Solution
    Cadmium is a heavy metal pollutant. Heavy elements like cadmium, lead, zinc, mercury cause heavy metal toxicity in plants.
  • Question 8
    1 / -0
    Which of the following is a trace element required only in small amounts by most living things?
    Solution
    Iron is required in living forms in trace amounts, which if increased causes toxic effects. Deficiency of iron leads to anemia. The daily requirement of iron for an adult man is 8mg/day and for an adult woman is 18mg/day. Iron is important for the plants as the plants can not produce chlorophyll without the iron.
  • Question 9
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    Which of the following component is present in our body in the smallest amount?
    Solution
    The percentage of phosphorous in the human body is about 1%. Phosphorus is an essential element that is necessary in the body, since it is used for bone and teeth formation, as calcium on its own cannot build sturdy tissues and bones.
  • Question 10
    1 / -0
    First experiment related to the method of hydroponics was done by
    Solution
    Hydroponics is the technology of growing plants in a nutrient solution composed of water and fertilizer. The word hydroponics is derived from two Greek words: 'hydro' meaning water and 'ponos' meaning labor. The term hydroponics was first used in the late 1920's by a professor in California named Dr. W.F. Gericke. He developed a technique, pioneered by German scientists Sachs in 1860.
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