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Natural Resources Test - 28

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Natural Resources Test - 28
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Carbon dioxide is withdrawn from the carbon cycle in the forms of 
    Solution
    The carbon cycle is the constant transfer of carbon dioxide.
    This also includes the formation of carbonate rocks such as limestone and carbonate shells in animals. In these forms, carbon dioxide can not be directly obtained by the process of decomposition and thus is withdrawn from thee carbon cycle.
    The correct option is D.

  • Question 2
    1 / -0
    Which of the following layer of the soil contains more humus?
    Solution
    • Humus is the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms.
    • The uppermost layer is called topsoil and this layer contains humus, plant roots, and living creatures. 
    • The more humus found in topsoil, the richer it is in nutrients and the better conditions it has for growing plants.    
    So, option B is the correct answer.
  • Question 3
    1 / -0
    The role of bacteria in carbon cycle is
    Solution
    Bacteria are  decomposers that decompose dead organic matter and releases carbon dioxide to the atmosphere for its recycling. Carbon cycle involves processes like decomposition and microbial respiration which is mainly carried by the bacteria.
    Therefore, the correct answer is option C.

  • Question 4
    1 / -0
    The loss of water from the surface of a leaf in the form of water vapour is called __________.
    Solution
    Transpiration is the process in which plants lose excess water in the form of vapour through their aerial parts. 
    In the water cycle, transpiration plays an important role in contributing a significant amount of water vapour to the atmosphere.
  • Question 5
    1 / -0
    Which of the following is natural resource?
    Solution
    • Natural resources are materials provided by the earth that humans can use to make more complex (man-made) products.
    • If we use a product directly as obtained from nature, they are termed as natural resources.
    • Tea is not a natural resource but tea leaves are natural resources.
    • Cooked food is not a natural resource but raw food are natural resources.
    • Coffee beans are a natural resource, coffee is not natural resources.
    • Air, on the other hand, is available to us naturally and hence, is a natural resource.
    Hence, the correct option is 'C'.
  • Question 6
    1 / -0
    The bacteria present in root nodules of leguminous plants, and can fix the atmospheric nitrogen is:
    Solution
    Rhizobium is a bacterium found in the root nodules of leguminous plants. It induces the formation of special structures called nodules inside which it fixes atmospheric nitrogen. It does this with the help of nitrogenase enzyme that converts of nitrogen to ammonium that is an important factor required for plant growth. In turn, the bacterium receives shelter from the plant. 
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    The function of bacteria present in the root nodules of leguminous plants is:
    Solution
    The roots of leguminous plants form a symbiotic association with a bacterium, Rhizobium. 
    The bacteria penetrate the roots and form nodules. They help in the fixation of atmospheric nitrogen by converting it into usable nitrogenous compounds.  Thus, the correct answer is option C.
  • Question 8
    1 / -0
    Which among the following is not a natural resource?
    Solution
    • Natural resources are resources that exist without any actions of humankind.
    • Air, water, sunlight are natural resources and are used by humans. 
    • While drugs are man-made. 
    So, the correct answer is option C. 
  • Question 9
    1 / -0
    Depletion of ozone layer is noticed on 
    Solution
    Depletion of ozone layer is noticed all over the earth.
    Ozone is destroyed by collisions with other atoms and molecules.
  • Question 10
    1 / -0
    Global warming could result in wide ranging effects on:
    Solution
    Global warming could result in wide ranging effects on rainfall patterns, agriculture, forests, plants and animals.
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