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Mineral Nutrition Test - 29

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Mineral Nutrition Test - 29
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  • Question 1
    1 / -0
    Insect captured by carnivorous plants partially meet their requirement of
    Solution
    The plants which derive most of their nutrition by capturing and consuming animals such as insects and arthropods are known as carnivorous animals. They are also known as insectivorous plants. Such plants are mostly found in damp heaths, swamps, muddy and sandy shores where water is abundant and nitrogenous materials are often scarce or unavailable because of acid or other unfavourable soil conditions. Thus to meet their nitrogen requirement, they have adapted to develop trapping mechanisms which is a modified leaf. For example, pitfall traps in pitcher plants employ a hollow lidded leaf filled with liquid to digest prey. Other examples of insectivorous plants include, Drosera, Utricularia  and Venus fly trap.
    Thus, he correct answer is option D.
  • Question 2
    1 / -0
    A free-living nitrogen-fixing cyanobacterium which can also form a symbiotic association with water fern Azolla is

    Solution
      • Anabaena belongs to the family of filamentous cyanobacteria that is known for its nitrogen-fixing ability. While these exist as plankton, it is known to form symbiotic relationships with the water fern Azolla and is found growing together at the surface of streams and ponds on temperate and tropical regions.

      Therefore, the correct answer is option A.
    • Question 3
      1 / -0
      For growth of which of the following sodium is required ____________.
      Solution
      Sodium is required in very small amounts by the desert shrub-Atriplex.
      So the correct option is D.
    • Question 4
      1 / -0
      On the basis of symptoms of chlorosis in leaves, a student inferred that this was due to the deficiency of nitrogen. This inference could be correct only if yellowing of leaves appeared first in

      Solution
      On the basis of symptoms of chlorosis in leaves, a student inferred that this was due to the deficiency of nitrogen. This inference could be correct only if yellowing of leaves appeared first in young leaves followed by old leaves.Chlorosis is the main symptom of nitrogen deficiency. As a result, the leaves gradually become pale or yellow. These symptoms first appear in old leaves and later in young leaves.
    • Question 5
      1 / -0
      Which of element is given in less quantity to develop attractive colour to apple

      Solution
      Nitrogen is given in less quantity to develop attractive colour to apple. Nitrogen is essential for all types of metabolic activities. During ripening, a small reduction in nitrogen supply increases carbohydrate content of fruits and storage organs. It also intensifies coloration in apple.
      So, the correct answer is 'Nitrogen'
    • Question 6
      1 / -0
      Which of the following deficiency may cause leaf tip bending

      Solution
      Sulphur deficiency causes chlorosis in young leaves.
      Leaf tips and margins roll downwards and inwards. e.g., Tomato, Tea etc
    • Question 7
      1 / -0
      Crop rotation is helpful because

      Solution
      (a) If the same crop is grown year after year, fertility of soil is lost due to utilization of same minerals again and again, thus disturbing the soil structure, which facilitates soil erosion. Legumes are useful in rotation of crops because of having nodulated roots and it gives more nitrates in the soil.
    • Question 8
      1 / -0
      Legume plants are important for atmosphere because they
      Solution
      Legume plants belong to Fabaceae family. They host bacteria in their roots within structures called as root nodules. These bacteria, known as Rhizobia, have the ability to take nitrogen gas (N$$_2$$) out of the air and convert it ammonia or nitrate that is usable to the host plant. This process is called as nitrogen fixation. The legume and Rhizobia form a symbiotic relationship which increases the soil fertility.
      So, the correct answer is  'Help in NO22 fixation'
    • Question 9
      1 / -0
      Chlorosis etiolation and albinism are caused by the deficiency of

    • Question 10
      1 / -0
      Slow rate of absorption of ion at high temperature is due to

      Solution
      At high temperature more than 500500 C the enzymes become inactive which effect the rate of absorption of minerals from soil.
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