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Natural Resources Test - 23

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Natural Resources Test - 23
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Soil is formed by the _____.
    Solution
    Soil is formed by the breaking down of rocks by the action of wind, water, sun, and climate. This process is called weathering.
    So, the correct answer is option C.
  • Question 2
    1 / -0
    The process of converting ammonia to nitrate by bacteria is known as ?
    Solution
    The oxidation of reduced nitrogen into nitrates and nitrites naturally by ammonia-oxidizing bacteria is called nitrification. Example Nitrosomonas, Nitrosococcus, etc
    So, the correct answer is 'Nitrification'
  • Question 3
    1 / -0
    Which of the following set is green house gases?
    Solution

    Solution:

    • Correct answer is option D

    • Explanation for the correct option
    • Greenhouse gasses generally traps the radiations of the earth which leads to an increase in the temperature of the earth and global warming.
    • The greenhouse gasses include water vapor, chlorofluorocarbon carbon dioxide, methane, nitrous oxide, and ozone.
  • Question 4
    1 / -0
    Which of the following present in the soil is most helpful to the growth of plants?
    Solution
    Humus is a type of organic material. It is present inside the soil in the form of a dark-coloured substance. Humus is formed by breaking down of plant litter that includes dried and fallen leaves, branches twigs etc. along with dead bodies of animals and insects. Over a period of time, all these decompose and cause break down of their complex substances into simple ones. It contains some of the important chemicals required for the soil for its nutrient maintenance. 
    So, we can say that humus provides nutrients to the soil. Apart from this, in its presence, air and water can percolate through the soil particles easily, increasing its efficiency.
    So, option A "Humus" is the correct answer.
  • Question 5
    1 / -0
    Soil erosion is caused due to:
    Solution
    Causes of soil erosion are:
    (i) Uncovered loose soil gets eroded when it is exposed to strong winds. The winds carry away the soil particles to other places.
    (ii) When rain falls on the unprotected topsoil, rainwater washes it down into the streams, rivers, etc.
    (iii) Farmers loosen the topsoil of the agricultural fields either for cultivation or for removing the weeds. Sometimes due to certain reasons, these agricultural fields remain fallow (not cultivated) for a long time. Top loosened soil of these agricultural fields, thus, becomes prone to erosion by winds or rains.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    The process of losing water by plants is called ____________.
    Solution

    Transpiration is the loss of water from a plant in the form of water vapour. It helps in the absorption and upward movement of water and dissolved minerals from the roots to the leaves.

    So, the correct option is B. 

  • Question 7
    1 / -0
    Nitrogen fixation can be done by:
    Solution
    A number of bacteria like Rhizobium and blue-green algae take up free atmospheric nitrogen and convert it into ammonia that combines with organic acids to form amino acids. This process is called biological nitrogen fixation.
    During lightning, the high temperatures and pressures created in the air convert nitrogen into oxides of nitrogen. These oxides dissolve in water to give nitric and nitrous acids and fall on land along with rain. These are then utilised by various life- forms. 
    The chemical fertilizer factories produce ammonia by combining hydrogen and atmospheric nitrogen under high pressure and temperature. This process is called industrial nitrogen fixation. 
    So, the correct answer is option D.
  • Question 8
    1 / -0
    The presence of lichens in an area, indicates ___________ area.
    Solution
    • Lichens are well known as sensitive indicators of air pollution. 
    • They are found to be very sensitive to the levels of contaminants like sulphur dioxide in the air.
    • Air pollutants can damage lichens and prevent them from growing. This makes lichens natural indicators of air pollution. 
    • Lichens are found in a clean environment that is free from air pollution.
    So, the correct answer is option A.
  • Question 9
    1 / -0
    The major source of formation of soil is:
    Solution
    Rocks are the parent materials, from which soil is formed. Weathering and disintegration of rocks lead to the formation of soil. These processes usually occur with the help of natural processes such as rain, floods etc.
    So, the correct answer is option A.
  • Question 10
    1 / -0
    Oxygen is returned to the atmosphere in only one major process, that is, respiration.
    Solution
    Photosynthesis is a major process which is involved in returning oxygen to the atmosphere.
    The given statement is False.
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